Should I switch off my Audi A4's ESP to improve control in snow and ice?

I bought a new Audi A4 2.0 TFSI (211) Multitronic in May last year. In winter weather I missed my old 2.5 auto X-Type, which had AWD and seemed much more sure-footed. I have found the A4 difficult to control...

Which tyres could I fit to my 2009 Peugeot 308 which offer quieter running than the Continentals it currently has?

I recently purchased a 2009 Peugeot 308 Verve 1.4 fitted with Continental tyres. Could you please tell me if anybody as done any research that would indicate that a different make of tyre would run quieter?

Is there a known problem with the FIAT 500's stop-start system?

Please can you tell me if you are aware of an engine management problem on the FIAT 500? I understand there have been a number of complaints. I have had a problem with my start-stop on a 1.4 Lounge.