January 2005 54 reg FR 150 TDi
Done a little over 160k - owned since 2008 and around 85k.
What fuel cleaner are you using? Mine failed on emissions last year and I paid a garage to do it for me and the emissions ended up being half as much as the MoT limit, but if I can get a good one and do it myself, I'd much rather do that.
2003 TDI 110 - bought in 2006 with 22k now on 144k
It's just a smoke test for the MOT on the TDI. You could try an injector cleaner but on a well maintained engine (clean air filter etc) it's normally soot in the exhaust from town driving. If possible take it out for a good blast on the way to the test, I try to book my MOT for first thing on a Saturday. I live near the M4 and use the local slip roads to rev out the soot a few times.
Couple of years ago the car was unexpectedly in the garage and had the MOT done at the same time. I didn't get a chance to give it a good thrashing beforehand, it passed but the smoke test value was a lot higher.