So what you were saying was right! Your experience speaks volumes!
So had an electrician come out and he has found the fault as the rail pressure whilst using the diagnostic machine (p0191 and also p0001). He also checked if the engine was turning over (I can’t remember the exact term) and it was cranking…. But the rail pressure just stayed at 2 or 3. Do you have any idea how I can fix this…. It’s very possible the mechanic i used who damaged the secondary pump has done something which has caused this…. Really appreciate any help on this!