I had a failure would not operate the solenoids, swapped ECU and worked, due to amount being scrapped, tons of spares

May have blown the solenoid drivers.

Try a second hand ECU off Ebay

Nanocom not great with ACE, hence Hawkeye

Try a self test on the code reader , Also Hawkeye to read codes

Got the letter from PCS so going to try for a blue badge

Money I think

Not doing a thing now as completely exhausted. Effing long covid

My charger is a basic one I was given. For now will pre charge before starting if really cold, until I can work out any issues.

Am I? I want surprised to find they were optional as the one I bought has a diff lock.

I don't think it has been over zero for a week, started after one hour on a small charger. Last year the battery went flat due to failing alternator, but was ok after 4 days on the little charger. I think the glow plugs are not great as it had to churn for a couple of seconds and smoked a lot...

Does it move in diff lock, could be a rear halfshaft if it moves with diff lock, that is most likely the issue

And in summer no problem for a week, just under zero c and having to glow plug for 15 seconds. Hence think battery

I am sure it is some form of parasitic drain combined with not great battery, it was not flat, just not good enough to fire.

Alarm? Key RF module? Also been very cold since 3rd

alternator is newish and charging at a good rate

yes

Did long run Friday last week 20 or so miles, today won't start. On charge, can I fit a bigger battery, or one which does not drain as quick?

Sounds like pressure sensor on front of block

Don't buy ****part. Mine is fitted two years, gaiter gone, and starting to get noisy. Will rebuild the original. May be worth buying a S/H genuine