At least you are making me feel better for not being able to give a cast iron ID. 
Moderators: timetravel, ukdrn
It looks like a Norton,how about Phil Brister or Chris Hatherly from 76
Could be but deffinately not 76 cos no one in the class had wheelie bars then, if I remember correctly the first one with bars was Les when he put the turbo on the bike, i think 77.
Looking at programmes for 77 only Phil Brister The Tortoise and 79 Ian Hodges are Norton mounted,there's a few Triumphs Dave Belcher,Eric Dowler and Tony Lewis
I had wheelie bars in 76 ......however i was racing in comp class then EC146.....The motor is certainly a Norton However that isnt a stock frame preety sure it isnt phil brister.
Here`s a few more for you to identiy, can`t remember if i`ve already posted them,
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You are trying to make life difficult with some of those shots Roy!
In order they are:
Ton Pels
Dave Branch, with Pete Smith's bike behind
Lloyd brothers triple Kawasaki
Brian Chapmans Super Mouse
Excaliber - know the bike but cannot bring the rider to mind. Need to think about that one.
Nigel Patrick
Phil Brachtvogel
Cees van Dongen
In order they are:
Ton Pels
Dave Branch, with Pete Smith's bike behind
Lloyd brothers triple Kawasaki
Brian Chapmans Super Mouse
Excaliber - know the bike but cannot bring the rider to mind. Need to think about that one.
Nigel Patrick
Phil Brachtvogel
Cees van Dongen
I think we`ve looked at that one of Excalibur before and decided that it was Stuart Fearnside.
Here's a few more gems to keep you thinking over the holiday season 
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Good luck
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