last time i saw red diesel it was about 52p per ltr - DON'T use it in your horsebox or towing vehicle though - VOSA have been VERY active lately, dipping tanks is a particular favourite of theirs.....you can buy bio-diesel in some places this is legal to use.....
Diesel price depends on which area of the country you're in. But today it's looking around the 42ppl mark exc VAT. The prices are going up again! Last week you were looking at around the 37/38ppl mark.