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UKIP’s only Scottish MEP has launched a foul-mouthed attack on fellow Scottish politicians.

Blabbermouth David Coborn, the newly-elected UKIP MEP for Scotland, was overheard on a train journey slagging off a list of rivals.

In quick succession fellow passengers heard him describe gay Tory leader Ruth Davidson as a “fat lesbian” and Scottish Labour leader Johann Lamont as a “fish wife”.

Other passengers in the East Coast train journey last Sunday were shocked to overhear the UKIP politician launching loud personal attacks without a care for who was overhearing.

As the insults flew Coborn told his travelling companion that the Greens were a “cult-like scientology” and made frequent references to “Nigel” and Brussels.

The incident will be a major embarrassment to UKIP leader Nigel Farage whose party conference opens at Doncaster race course tomorrow.

During the journey south last Sunday passengers in coach M of the East Coast train heard the loudmouthed MEP taking calls from party colleagues on how to target voters in Scotland.

A number who witnessed Coburn’s tirade recounted how he told “Joe” on the other end of the line not to worry about the Greens.

They described him saying: “Don’t worry, the sort of person who would vote for the Green Party would never vote for us.”

Coburn added: “Voting Green is a cult like Scientology or something.”

In a previous call he discussed party funding and told a caller that “my friend Maurice the Money will put the money up for that.”

Coborn, who was born in Glasgow and lives in London, seemed very concerned that someone was leaking information on the party.

He mentioned several times that they needed to “solve the Monkton problem”.

He then asked the caller not to talk to anyone about the matters they will be discussing at conference.

Before signing off he told the caller that his prescription for the party was to “get rid of the old farts basically”.

Yesterday 55-year-old openly gay MEP said he could not remember the details of every conversation he had on trains.

He said: “I’m a fat Scotsman, there so. I don’t recall any of this.”

A UKIP spokesman lated added: “David Coborn has no recollection of the alleged conversation.”

Little has been seen of Coborn in Scotland since the unexpectedly won the country’s sixth Euro-seat in the May elections.