Very Happy First time Jag owner

Hi All, my name's Paul and I live on the outskirts of Herne Bay. After a years looking, researching and buying every Jag magazine I could find, I could not make up my mind on whether to sell my '72 MGBGT for a XK8 or trade my trusty 2003 Diesel Rover 75 (now on 196,000 and never a breakdown) for an S Type. After looking at some 305 XJ's as an alternative to the S I ended up with a bit more of a heart rather then head decsion and traded the Rover for a 2009 2.7 Premium Luxury XF with just 14K on the clock. Boy am I pleased with the decsion.
Picked the car up Saturday and cannot stop driving it, even the kids have found reasons to come home to have a ride and try and persuade me to let them have a drive, such is the allure of the Jag!
Would like to explore having the car remapped, as I did for the Rover, as I do 30K+ per annum and the additional fuel return is very welcome, not withstanding the extra oomph when you occasionally need it. Any recomendations as to who I should talk too?