Hi Damien,
With regards to DPF removal, yes it can be done but it is being made illegal and will result in MOT failure from next year due to emissions etc see here:
http://www.autoexpress.co.uk/car-news/consumer-news/84818/mot-test-fail-dpf-removal
For a remap try someone like superchips, they've been doing it for years and are fairly well respected.