2010 model avensis 2.0 d4d

Cost of repairs can be more than the car is worth

DPFs don't give alot of trouble on those cars. however they can have injector problems which are costly enough to replace. You also cannot compare a taxi to occasional use when it comes to potential DPF issues. Taxis can do hundreds of short journeys in a day every day so the engine is running at optimal temperature most of the time meaning the DPF regeneration will complete it's job compared to a car being driving on one or 2 daily 15 min runs to the shop or school run.

If you need a family car don't have use for a diesel then take a look at the Prius hybrid. Alot of taxi drives have switched to them now too.