When the cars cold it starts straight away, but after a drive when i stop and turn it off it wont start! it will turn over once or twice really slowly, then it will jsut stop. however when it gets cold again it starts first time?

the manifold and turbo e.t.c are all standard, is there ment to be a heat shield on the starter motor? is it likely to be the starter getting cooked? or is there maybe something else? bad earth or something?

this is my first rs turbo so dont really know where to start!