Silver often lost places during races at Swindon, simply because he would pull a full locker and virtually stop. On small tracks like Rye and Arena where he did his apprenticeship you have to turn a bike hard,  but There is no need to do that at Blunsdon, something Andrew never learned. 
 That apart, I do believe he didn't use his talents to the full, which is a shame, but there you go. 
  
I do recall him turning up to a meet. at Swindon at 7.30 pm and he was so layed back about it, he had to be lifted onto his bike, not sure why!