The "Wilfred Brambell" bit is definitely a reference to the Steptoe actor. But it's also to "gurning". Ecstasy, and other stimulants, can make people screw their faces up, pull silly faces. It's a sort of irresistible compulsion to do! And Tyres is an old-fashioned raver who takes lots and lots of ecstasy. So it's a bit of a rave culture thing.