I got the cooling systems issues sorted with some help from NickT. Leaking hoses on the rad had caused an air lock in the pump.
I'll summarise this and say its fine now, but getting the ally rad to seal on the hoses has been quite problematic. A switch from silicone to rubber, and changing the clamps has helped but not eliminated the issue.
The headlamps are now all H4s, and the buckets and brackets painted. I changed the chewed adjustment screws, and used new stainless screws on the bezels Wiring had been previously remedied. I also fitted the headlamp finishers I bought in.... 2012..!!
I've had the front fascia on and off lots and lots, in an attempt the get a better fit. Not quite their yet, but its not as tight round the headlamp units following a bit of easing with the file.
I filed slots into the fascia to allow access to the retaining and adjusting screws.

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These are not too noticeable when fitted

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The major bit of damage in the top corner is unsightly and is going to need a careful repair.

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I think this has in part been caused by the headlight "stretching" the shrunken fascia. Its been repaired before in the past, and was ok for the last 8 years so cant really complain too much. However, it will need remedy.
With the fascia off, I used some expanding foam filler to patch up the impact absorber. Its not pretty but I'm not going to waste time beautifying something not seen.

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With all the gubbins off, I replaced the rusty self tappers and mild steel washers with captive M5 chimney nuts, stainless dome head allen screws and stainless washers.

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Some of these washers have subsequently been chopped down to help fascia fitting.
I have also been repairing the studs in the chin spoiler

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So over the weekend I fought for a few hours trying to get acceptable gaps between the fascia and front wings. Adjusting panel gaps is almost an exercise in futility on a DeLorean. Overall, its getting better, and the most important thing for me was the fascia fit around the headlights (and mounting / adjusting screw access), but I have been doing a bit of reading on whether I not I can close the gap at the top corners.
I have been grinding and cutting clearance on various bits and pieces, but the fight is not over yet. My God, these cars are frustrating.
Thankfully the back is ok, and is probably about ready for paint. Lets see how all this pans out.
(Then fix the little weep on the rad). Ugh. Am quite sick of it!
Andy