^ I wouldn't disagree with Andy there, tbh.
15 miles a week is probably just under the 'diesel justification' limit, however my approach has been that I simply ensure I 'clear out' the DPF manually at least once a fortnight to avoid any DPF issues. This is simply; let the car warm up as normal, take it for a short 'hot' drive revving freely through the gears to motorway speeds, then let it cool down before turning off to allow the turbo it's normal cool time. You don't need to go far.
I took mine on track a week ago Saturday and it only did one forced DPF Regen when the engine was up to temp after my first four or so laps, which I let it do as obviously oil temp was well over 100 degrees celcius. I used just under half a tank for around 34 laps, 50% of those being fairly flat out laps at Bedford.
This strategy has worked nicely for me absolutely trouble free for 2 years as of next month. I've interrupted auto DPF regens too and it's not given me the slightest of issues so far in over 25,000 miles.
Quite frankly if I ever get DPF issues, I'll take a trip to Alex and he can
AKS-Tuning the Audi's DPF