I thought I would change the battery as we are due some very cold weather.

Since changing the battery:
*the fobs don't work.
*central locking doesn't work (doors can be opened individually with the key).
*clock and temperature display not working.
*mileage display not working.
*car doesn't start.

I have searched through various forums to try and solve the problem with no success.

I have checked:
* all the connections with the battery and all the earthings - all fine.
* fuses - all fine.
* tried to reset the fob (instructions from the manual).

I've spoke to a couple of mechanics and auto-engineers that I know and they have all said it will have to be a main dealer job? Does anyone have any other suggestions before I go down that route?

Thanks in advance,

Stevie