Original comment: Here we have 20 - The Biker's Telegospel vid from 1990!
20 (Wil Evans and Chris Job) made amazing shinpads, which were machine washable and had removable padding - so they didn't smell like they'd been chucked in a bag of fish and chips.
The first midschool UK BMX video? The only other one I can think of is Smart People in a Car Crash.