A bridge crossed

I took B's Focus to a brilliant mechanic (it is always reassuring when you realise the person working on your car is cleverer than you) who physically removed the DPF and remapped the ECU. Driving there in a careful manner I managed to get 49mpg - which is the most I have ever seen on the trip computer thing. It is usually around the mid 30s because it is constantly trying to regenerate the shagged filter. Driving back I got it to average 62.4mpg. And he knocked £50 off for cash.
I had to cycle around for 5 hours (including a stop at a pub of course) whilst it was done which resulted in the two speed hub going a bit wonky and noisy. I was tempting fate. It'll have to come apart.