Key,
Speak to Commando aka Boxhead. He had some track bikes in his shed - not his shop - and he had muttered something about looking at getting rid of some. If they were for him then they would be too large for you - Box rides about the same size as me, and my track bike is a 56 - but it is worth asking the question.
Also ask Robbo - he has something to do with the Velodrome selling track bikes.
MC