Firstly thanks to all for your ideas and I will answer as I can
Musky
I did exactly that with a hose but I doubt that I went up to 20 psi so good call a recheck on that one
Gauze too tight, now thats not a bad call I have checked that the sump pipe has not been bent down to hit the pump and that has a load of clearance but that gauze is tight maybe I should check that out
Yes the crankcases are untested but I obviously checked all the oilways and blew them thru but the one from the PRV valve still worries me its tiny and maybe some crap has got in ther to block that.
The breather slipping as well is doubtful but well worth a check
When it comes to the oil pump, yes it has the spacing washer behind the drive and yes it has the fibre washer under the front bold. As for the gasket I always specifically check the holes line up perfectly knowing what gaskets are like nowadays.
The oil pump was not changed as such, it was on my other A10 and running fine but I put a rev counter drive on that and used the pump on the plunger engine when I rebuilt it so in my eyes it should be good.
Oil lines round the wrong way? Thats not really possible on the plunger as its totally different to the swinging arm model
End float I managed to get down to 2 thou which is pretty good in itself, I did use shims instead of making a one piece shim but there is no sign of anything in the sump that would indicate them breaking up, plus its done it from the start and I have only done 100 miles on it now
I will say I have dropped the sump 3 times now and on two occasions I have considered it had too much oil in it so my next move is firstly to degrease the damned thing its coated in oil yet again but at least I know it wont rust

Next I am going to take the PRV out of one of my running A10's just in case and put it in this one as a test
If that fails I am going to strip the timing case side down, check the breather location and send the oil pump away for a recon unit, a guy on the south coast has said he will do a recon exchange pump for about £85 which is not unreasonable.
While the pump is off I am going to (yet again) whack an air line on all the oilways particularly the one down to the sump to see if that has some form of a leak or something in it.
If all that fails I might seriously consider setting fire to it
