Yeah but mum is out in the country, 30 miles north of Aberdeen so maybe that's why it's expensive
I used to have an old clapped out Diesel Fraud Escort that I bought for £30, I still to this day don't know how it went through an MOT but it did, Anyway I blocked up the original fuel tank and threw a tenners worth of white diesel in the tank, I got a old small tank off a mate and fitted it in me spare wheel well and filled it up with red from the farm I worked on I could run backwards and forwads to work (12 miles round trip) on about £2 of Diesel a week (this was way back in 200 when diesel was a hell of a lot cheaper

if the plod ever dipped me tank they would get the white stuff
EDIT: I think farmers are allowed to run their 4x4's on red diesel so long as they are travelling to another field they own and not going over a certain distance, same as tractors, why should a farmer put white stuff in it when it spends 90% of its time in a field, so do farmers jeeps