I am glad I was sat down when I called my local dealer for a quote, 7.5-8 hours @£145 per hour +VAT, so over £1,300 in labour, oh and £47.86 for the actual part
Actually it was worse than that, their tech suggested it was actually the lambda sensor as "your car doesn't have a DPF sir"! When I explained that it clearly did have TWO of them and maybe he should check they spoke to the master tech who advised that apparently they need to "remove the gearbox", which is weird because that's not what ELSA says but what do I know!?
In any case, not very confidence inspiring!
Now awaiting a call back from a couple of indi's who hopefully will know their arse from their elbow!