£36,000 that must be some van mate , my DPF used to clog every 4-5 wks since i have done what i said in previous post i have had no probs ,
For the particle filter to be kept clean the exhaust must reach a very high temp then when its reached that high temp the van or car needs to be kept running for about another 10- 15 mins which means a drive of about 20-30 mins of normal driving ,
particle filter regen takes place without the driver knowing , but if the car or van engine is switched off the regen process will have to start over again which means it will continue to clog without a good drive out each week