Hi, I am wanting to replace my stereo with a posh double din with sat nav etc. Where can I get a kit from to install it, and is it possible to get a stereo with a trip computer so I can still see my consumption, miles left etc. Have included a pic of my current stereo.

You can fit a double din unit with a cage, it'll drop straight in. Some are a tad small, and you'll need a spacer, but my Kenwood was a direct fit.
I don't know any that will give you your consumption figures etc. what year is your car - does it have an OBD port under the dash on the driver's side? if so, you could fit a scangauge - loads of instant info from them

No obd port. Will have to live without it, would much rather have a decent stereo with satnav.