thanks for your reply GVK - you are correct
I have managed to get to the bottom of this and car now performing very well, for future reference if any of you guys get these two codes showing,
As we know P0100 is the air flow / MAF meter, quite simple on this i removed the meter and cleaned with a quick drying non residue contact cleaner, simply unscrewed cleaned and returned, i did not disconnect the loom from the meter as these wires are a bit delicate.
Upon test drive the glowplug returned which was annoying, as for a while it performed ok, this time the engine management light came on and the car just cut out, apparently some fault codes show on the glow plug warning light first and then after numerous activations the management light shows and stays on - thinking the worst i got it round to my local diesel injection specialists who ran a full diagnostic check and leak test to check the injectors and a fuel line pressure test - thankfully all injectors were ok but the pressure test was very low indeed so new ford diesel fuel filter fitted and job done - car is now back to life and a pleasure to drive again.!
ATB
Steve.