I'm away week after next so can't get it down there any time soon but he has assured me it will not develop any further and is just a "counter" he must've forgotten to map out.
Apparently, this error code comes on if a pre-set amount of failed regens occur.
I'm not best pleased because it's a 200 mile round trip but at least it hasnt broken my car.
Just found a large split in my induction hose too (jubillee clip on the turbo side way overtightened) so that's me £50 lighter for a replacement.
It seems that that nice turbo whistle/whoosh I've been getting when coming off boost the last 6 months isn't a good noise! LOL