Well, I've been working my way through all my error codes that I inherited with my car, (originally there were errors in every section!).

Well I now have it down to just 3 errors left.

Permanent Fault P0101 - Flow meter signal, Air flow to low Coherence.
Permanent Fault P0380 - Pre-Post heating relay circuit, short to positive
Temp fault (no Code) - Amount air measured higher than setting.

Now this was a little discerning for me as one of the first jobs I did was to fit a new MAF to the vehicle when I got it as it was very slugish, low and behold it did the job. So to see a flow meter fault is not very good!

Now that I have examined the circuit diagrams I find that the Glow plugs and flow meter (MAF) share common wiring!

As I am 99% certain the MAF is functioning correctly I am suspecting that the short on the glow plug circuit is also generating the Fault on the MAF. and also the temp fault as well.

I have run all the diagnostics from within lexia pertaining to the faults and all seems well (all relays etc can be heard functioning). So as soon as I get some decent weather I'll be out checking the wiring.

Just wondering though if anyone has had this before?

seen those faults on just about every one Ive had in!
I don't think P0101 brings up the engine management light though.
P0380 at worst will be new glow plugs (if you can get them out and in one piece).
try switch cleaner before swapping parts though!