Firefighters were called to a roof blaze at Leavesden Studios this morning.

Construction workers refurbishing an old office building on the site were evacuated when piles of rubbish on the roof caught fire, at about 9.45am.

Smoke could be seen rising from the studios as far as the A41, before crews from Garston and Watford contained the blaze.

Firefighter Hazeldine, of Green Watch, at Garston Fire Station, said: "We managed to prevent what could have been a very big fire. We saw it from a long way away as we approached but, fortunately, it hadn't caught the whole roof. It looked quite substantial but we managed to get it under control."

The cause of the fire, which was extinguished at about 10.50am, is being investigated.

The studios have been made famous as the location where the Harry Potter films were made.