It's not getting any better - Today we had a new customer roll up with a 2007 BRE engined 2.0 PD with DPF, EML & Glowplug lights lit.
Diagnosed a blocked DPF - DPF Ash Mass of 47g & loading coefficient of 92% all other factors that cause DPF issues checked out okay, car had done 80K.

Quoted for a software update (BRE original software suffers repeated failures to regen), new DPF etc at over £1000 + VAT to rectify.

Owner advised he'd pay the diagnostic & take it somewhere for a DPF off & remap.
We advised it is illegal, possible MOT failure etc & he replied, "the MOT is just a visible presence check - if the DPF housing is there the tester can't fail it"

To our knowledge he is not in the trade but was remarkably well informed of what he needs to do next to save himself some corn............