I've now moved on from my brake issues as they are fixed!
Oil pressure is literally pushing the needle past 5 bar till the needle hits the side of the gauge at what would be around 7-8 bar.
Now when it was doing it 3-4 months ago I gunk'ed and washed the back of the engine and it was ok for a bit (car still not being used, so was in reality probably only ok for a couple of times it was run for 5 mins, then used.) When it was OK'ish it was fluctuating +-1 bar around 4.5/5 bar when at a steady idle. Not fluctuating due to engine rpm, was due to either blobs of oil (which was clean), crap in the oil (possible I guess) or a sticky oil pressure regulating bit.
The question is, if it is simply a dodgy pressure regulating bit (the valve that people add nylon washers to to adjust pressure, to the right of the crank pulley), is there going to be an issue running high pressure till it frees itself off (I presume it will when properly hot after the car has been driven for a bit) or is it more possible that there is no oil actually going around the engine because there is a blockage just after the pressure sender and therefore a large pressure buildup and nothing reaching the cams/crank/turbo etc?
Does the pressure regulator do its stuff at the end of the oil system or at the start? Similarly, the presure sender, start or end?
Clearly if I'm getting a geniune 7bar of oil pressure at the "end" of the oil system before it hits the pump again then I'm getting a good flow through all the required parts. If at the beginning then I could be getting no flow to anything.
I guess I should just pull my finger out and rebuild the pressure regulator. I'm sure its just a bit sticky after not being used. Dirty hands time again.....
Ideas still welcome though