In the episode, Del buys a consignment of yellow paint which, unknown to him, is actually luminous, a fact he only discovers when they use it to decorate a Chinese restaurant.
Del Boy is at a Chinese restaurant called the Golden Lotus and promises the owner Mr. Chin to paint his kitchen before the health inspector arrives.
The next day, the Trotter Brothers and Grandad arrive at the Golden Lotus and find unlabelled tins of paint to use.
This is interrupted by Grandad, who asks how anyone is supposed to read a painted sign inside a pitch black railway tunnel.
[2] Del says that he will not bow his head to any town hall officials, but shall look them straight in the eye and say, "I am the man that's responsible – and I'm proud of it."