little update:

After leaving the car again for a few days, I decided to go and try to start it again.

The fuel pump primed as normal, the went off. Unfortunately, this time, the battery was nearly flat so I need to get that charged before I can get the car to actually start.

I'm totally baffled as to why the fuel pump is staying on constantly when the engine cuts out, but then seems to act normal once it's been left for a wee while?

Nobody got any idea's at all?