Abbas Sorry for not getting back earlier. I took my car in for some rear suspension, bushes and brakes etc and got them to run tests on the starting issue. They couldn't find anything wrong but they did change the "fuel filter" and suggested if it doesn't improve then said we should check, clean maybe replace injectors.In the meantime the chief mechanic suggested could be worth adding some injector cleaner to the diesel when I next fill up.
So I took a look at online reviews and went for Wynns Diesel Injector cleaner that I bought at Halfords, long story short just about gone through the tank of diesel and I haven't had any issues with starting in fact motor is running really sweet,