I normally leave my car standing for long periods of time (4-5 weeks) and should purchase a battery trickle charger. Can anyone recomend a type that works? Solar is no good.

I use an Optimate on my race car. Works very well. I'd recommend this but their website says it's too small. So the next model is the Accumate, details are here (http://www.accumate.co.uk/it010004.htm).

I use one of these... CTEK MULTI XS 3600 Z1456205 (http://www.vertar.com/battery-chargers-conditioners/ctek-multi-xs-3600/) it's a great bit of kit also it's usefull to know that this Optimate/AccuMate Extension Lead EXTLEAD (http://www.vertar.com/battery-chargers-conditioners/battery-charger-accessories/optimate-accumate-extension-lead/) extension lead will also fit it ;)