starts great from cold just read on auto solve that a drop in pressure from pump or the accumulator would cause a hard start problem after 5 -20 mins after engine turned off ,the under bonnet temp rises causing the fuel in the pipes to attempt to evaporate
maintaining the pressure eliminates this problem and eases a good start on a hot engine
sounds like the injector fault you spoke of
i have ordered a new fuel pump as i just want to rule a low pressure fault
out
i noticed the valve on the pump had been removed this made me wonder if the pump is up to the correct pressure so a ew one is a good place to start from