OK till checked by a loss adjuster in that hopefully never to happen worst case scenario. Or reselling car and a lot of places will be checking. Forewarned is forearmed, just considerall possibilities.
"It is an offence
under the Road vehicles (Construction and Use) Regulations (Regulation 61a(3))to use a vehicle which has been modified in such a way that it no longer
complies with the air pollutant emissions standards it was designed to meet.
Removal of a DPF will almost invariably contravene these requirements, making
the vehicle illegal for road use. The
potential penalties for failing to comply with Regulation 61a are fines of up
to £1,000 for a car or £2,500 for a light goods vehicle."