Cheers for the advise guys.
Look a saloon diesel out today and was nice, although it felt a little bit sluggish compared to my C Class even though they have the same power. Certainly not as a refined ride but then that's to be expected.
Also took out a base model with the DSG box and was mighty impressed by the slickness of the change. Made my car feel crap in comparison. The shifts felt non existent even with some spirited driving.
Still not sure on how to finance it yet but due to the options I want I'd be wasting money on a lease. Spoke to broadspeed who quoted £4135 off list price but then I have over 3k of extras that I'd like. Namely paint, leather, upgraded sounds, sunroof and glass
Also not sure about the engine, the diesel does seem ample for my needs. I also think it' will be even better with the autobox. With the figures from RealMPG I'll be spending another £600 - £700 on fuel a year. Just don't want to regret the petrol when the shine has worn off the TSI lump and I'm left with what could be a rather more expensive commute if by job changes.