DAF LF 45 wont start - SOLVED!

OK
To clarify, there was a few drops of fuel from the valve when I removed the fuel pipe. When I cranked engine there was enough fuel to make the top of the head wet and for a few drops to run down the fuel pump and drip onto the ground.
Do I go for just the prv (I assume this is pressure regulator valve?) or should I change the whole rail? Should I go new or secondhand to save money?

Thanks