dont mis-understand me jonny i am not bothered by cold personaly,i live in yorkshire were its bloody freezing most of the time!!just that i would not expect to catch many carp / barbel from a river in march, unless we have some freak tropical weather, or we are near a warm water outfall?or does thames fish well in cooler weather?my local rivers are a waste of time for carp/barbel through worst of winter weather,iam assuming most rivers are same,although weathers always a bit warmer darn sarf, if u know what i mean!!