###Bit long winded, but please read and suggest!!###
That was the strange thing, my golf always start quickly and easily - no fuss. But on this occasion it kept turning over with 0 signs of ignition. After 2 ish seconds of cranking the oil light would start flashing. It did this about 3 times (between 1st and 2nd time i checked oil - on max).
I changed nothing between 2nd and 3rd time, just waited a few mins, then I tried and it started with no flashing......
I guessed that there was some crap in the oil that had blocked something and therefor the ECU was stopping it starting as protection. Gonna change the oil today just incase.
Any other suggestions from you wise old owls out there?