Thanks Windy,Based on the new codes looks like starter.
The voltage too high is ecu not seeing voltage drop from cranking and possibly stop start is not seeing engine rpm so logging starter fault.
However the old codes (which hopefully were from low battery voltage as they have not returned), could also be related to a failing engine fuse box ask garage to check for signs of water ingress
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matey yesterday had a look and said nothing appeared to be draining it. If it went to Peugeot, would their Diag be much better than the RAC's and Snap on one the garage use? Windy couldn't find any faults when he came and plugged in but you'd hope/assume that the main dealer would be able to diagnose quickly? I mean if not, the future isn't looking great when electric cars are everywhere. I wish I still had my Honda Prelude, the kids wouldn't fit in it but I miss having a simple and brilliant car!Either something is draining the battery OR the battery has got an eternal fault.
I'd go for the something is draining the battery.