The guy who took the readings wrote everything down one of them reads "soot content high" but couldn't spend any more time with it as I went in because I was working next to the place and he broke off to plug it in and test it but couldn't do much else for me for the next 2.5 weeks as was mown out.
Went to auto electrician I've used before and from the readings I showed him he thought it was, for some reason, not regenerating so was going to try a regeneration I think he called it........he also mentioned replacement or removal.....I'll know more Wednesday when I take it in......removal without replacement isn't happening.........no warning lights are showing either.......I only do about 3500 miles a year and actually have to go for a run out on motorway to try keep it clear..............funnily enough did a 5 mile round trip today and no problem.