Find a garage that will remove the DPF and flush it through usually about £100-£150. This will not fix the source of the problem and will quickly re-block if the underling fault is not found.
Most garages will run a diagnostic and offer to replace what the see as a logged fault (commonly O2 sensor), they are usually wrong. If you ask if the can check the fuel trim long and short logs and they look puzzled they are not the garage you need.
https://youtu.be/5WnM_NsOtd8
Lessons learned with a Jaguar 2.7!
Read them both, sorry