At 9am John Finnemore surprised BBC continuity announcer Luke Tuddenham... You must enable JavaScript to play content The Lord of Misrule comes to Radio 4 John Finnemore surprises BBC continuity announcer Luke Tuddenham.

At the next junction John's brought fruit... You must enable JavaScript to play content John Finnemore has taken control... The Lord of Misrule won't leave. And he's brought fruit.

Then he started causing trouble with Ed Balls and Josie Long on Saturday Live... Photos of John Finnemore with Ed Balls and Josie Long

By 11am things got completely silly... You must enable JavaScript to play content John Finnemore insists the next announcement is in the style of school teacher He's messing with Luke now.

Next John bothered a Reverend... John Finnemore with Richard Coles

Even Week in Westminster was under the spell of Misrule with a panel of comedians... You must enable JavaScript to play content Theresa May and other impressions... Jan Ravens on how to do Theresa May, with Rory Bremner, Matt Forde and Steve Richards.

This was not true in any way... John Finnemore Tweet's from his own account

Evidence appeared that the Lord of Misrule had been about longer than we realised. This photo is from 2009... The Today programme's presenters, Ed Stourton, Carolyn Quinn, John Humphrys, Sarah Montague and James Naughtie and someone who looks a lot like John Finnemore.

And then John hacked into the Radio 4 Twitter account... John Finnemore took over Radio 4's Twitter

A new announcer took over and dealt with John with some aplomb... You must enable JavaScript to play content John Finnemore surprises Susan Rae She wasn't expecting this and we're pretty sure she doesn't like it.

This photo is from 1996. Isn't Barry young? Graeme Garden, Tim Brooke-Taylor and Barry Cryer with the much missed Willie Rushton and Humphrey Lyttelton... and John?

"It's like watching Brief Encounter" You must enable JavaScript to play content Actually Susan might be enjoying this John Finnemore is playing games with Susan Rae.

By mid-afternoon Susan Rae was fighting back... You must enable JavaScript to play content Susan Rae has had enough of Finnemore's fiddling He may be Radio 4's Lord of Misrule but Susan Rae is not doing what John Finnemore wants.

The Now Show got into the spirit of the day with a Twelfth Night special. You must enable JavaScript to play content At last The Complete Works of Shakespeare - start your collection now! Week by week, you can add to the body of work that you will treasure forever.

Even Gardeners' Question Time was in the firing line. Is nothing sacred? Just looked in on the @BBCGQT panel. All doing well.

Luke was less than delighted to find John still waiting for him when he started another shift... You must enable JavaScript to play content Luke Tuddenham is back in the studio (and John Finnemore is still there) John finds out all about The Life Scientific.

The on air comedy continued with Angus Deayton...

John was given permission to open a very special fader before the 4 O'Clock news... You must enable JavaScript to play content The Lord of Misrule waggles the pips Announcer Luke lets John Finnemore fire up the world famous Radio 4 pips.

Then John decided that he should start being nice to the announcers... You must enable JavaScript to play content John Finnemore is starting to feel sorry for the announcers The Lord of Misrule decides to give the continuity announcer some encouragement.

The comedy continued on air with Sue Perkins and Hold the Front Page... You must enable JavaScript to play content Who is to blame for danger? Sue Perkins asks the panel on Hold the Front Page.

Not content with bothering the announcers, John started showing up on the programmes...

John played a dog on Time Spanner, a time-travelling sitcom with David Mitchell - listen here.

With Susan back in the studio John was in a helpful mood... You must enable JavaScript to play content A helpful translation John Finnemore helps Susan Rae out by translating her continuity announcement.

More evidence has come to light that The Lord of Misrule has been haunting Radio 4 recording studios for many years... Here's John Finnemore giving Kenneth Williams a telling off with Nicholas Parsons during a recording of Just a Minute in 1981.

Apparently The Lord of Misrule was interviewed by Roy Plomley for Desert Island Discs back in 1973. We wonder what misruly songs he chose?

By the time Neil Sleat turned up for work he had an idea of what he was in for... Neil Sleat Tweets about John being in the office

Just before 6pm, the spirit of Misrule infused the Shipping Forecast... You must enable JavaScript to play content John Finnemore makes the Shipping Forecast 'good' The Lord of Misrule helps Susan Rae out with the Shipping Forecast.

Neil Sleat got his first taste of the Lord of Misrule at 6.15pm... You must enable JavaScript to play content The Lord of Misrule awaits Neil Sleat John Finnemore is still playing games with the announcers when the evening shift begins.

The Lord of Misrule might have caused a bit of friction between the announcers with this one... You must enable JavaScript to play content Neil Sleat flexes his impersonation muscle at the behest of John Finnemore The Lord of Misrule makes Neil Sleat impersonate his fellow announcer Kathy Clugston,

It was perfectly fitting having Harry Hill in the day's schedule. You must enable JavaScript to play content Prison break at the Egg Harry Hill stars as the governor of Britain's remotest prison, the Egg.

John had to get The Archers involved in today's shenanigans one way or another... You must enable JavaScript to play content What does a Radio 4 announcement sound like sung to the theme of The Archers? The Lord of Misrule John Finnemore gives announcer Neal Sleat a tuneful command.

By 8pm John was getting pretty intense... You must enable JavaScript to play content The continuity cop show John Finnemore shines a light in Neal Sleat's face and asks some tough questions.

We kept looking further back in the archive and The Lord of Misrule kept popping up. These two are both from 1958. John Finnemore tries his hand at farming with some characters from The Archers.

The cast of Hancock's Half Hour - Bill Pertwee, Kenneth Williams, Hattie Jacques, Sid James and The Lad Himself. Oh and The Lord of Misrule of course.

It's a good job Neil Sleat is so good at accents, otherwise this one could have bordered on the offensive... You must enable JavaScript to play content It's all gone Scandinavian in the continuity studio The Lord of Misrule pushes announcer Neil Sleat to the edge of political correctness.

By 10:30pm Neal Sleat was completely beaten down You must enable JavaScript to play content It sounds like Neal Sleat has pretty much given up Our announcer is made to introduce the next programme in words of just one syllable.

Jake Yapp nailed the sound of Radio 4 in his new show Jake Yapp Saves Humanity in 28 Minutes You must enable JavaScript to play content Radio 4 in four minutes Jake Yapp boils the Radio 4 schedule down to under four minutes.

At 11pm John managed to hack into the Radio 4 Twitter account one last time... John Finnemore describes what he can see in the Radio 4 continuity studio.

Here are the final pictures we found in the archive which show The Lord of Misrule has been misbehaving in Broadcasting House for a very long time. John Finnemore with Woman's Hour presenters Jean Metcalfe, Marjorie Anderson and Margaret Hubble in 1951.

John Finnemore getting misruly with The Goons in 1951.

Was the Lord of Misrule sinking to new lows on this one? You must enable JavaScript to play content Sarcasm is the lowest form of wit, you know John Finnemore apparently doesn't think sarcasm is beneath announcer Neil Sleat.

As we approached the end of the day John just wanted to be nice... You must enable JavaScript to play content The Lord of Misrule gives Neil Sleat's hair a quick trim The Lord of Misrule seems to be feeling sorry for Neil Sleat and does him a favour.