How do you decide what to buy next?

[greenlaneman]

I buy spares and repair in that well know auction site and anything that is repairable and fits in with my planned layout - late green/early BR blue in Kent - gets repaired and put to one side.
Cheap (relatively) and I have fun? fixing those that are to be put up for sale. Its cheaper than running a Land Rover but not so much use in getting to work in the frost and snow!