Workers at Legoland in Windsor were shocked to discover a Breaking Bad style drugs factory in the grounds of the theme park.

Some 50 marijuana plants – each around 3ft high – were found in a bungalow close to the entrance by workmen who were checking for asbestos.

The derelict building is situated on the site owned by Legoland but outside of the boundary of the park, according to The Sun.

View photos Around 50 marijuana plants were discovered in a cottage in the Legoland grounds (Rex/stock photo) More

MORE: This dog is minted: Chocolate Labrador gives birth to a puppy that is GREEN

MORE: Man jailed after leaving his pet ferret to roast to death in his car

A source told the paper: “The bungalow was set up with lights and watering gear.

“It’s not a few plants, it’s a professional farm.”

Thames Valley police said they were investigating the discovery of the drugs inside the bungalow, that is not accessible to the public.

A Legoland spokesman added: “Following security checks, we can confirm that illegal substances were found in a derelict cottage outside of the Legoland Park boundary.

“The building in question is inaccessible to the public and appears to have been accessed via the Crown Estate.

“We have notified Thames Valley Police and we will continue to support their ongoing investigation.”

No arrests have so far been made.

Top pic: Rex