Just set up a DropBox account and then take a photo of the receipt when you get back to your truck, and upload it before screwing the receipt up and chucking it away.. I do that and they're all there at the end of the month.
Buy in bulkMine get clipped to the ash tray using the springy lid.
When that's full, a handful are transferred to my egg box. (My problem then is finding sufficient egg boxes).
HMRC did once inspect my books which were presented with the appropriate eggs boxes full of loose receipts.
They came back all sorted and clipped together. The inspector presented me with an HMRC booklet entitled, "How to keep your accounts" (or something similar -- I haven't read it) and the words, "We won't be inspecting YOU again!".
So far, so good.
Storing DERV on farm very rarely makes financial sense nowadays unless you can buy in 20,000 litre tanker loads - A permanently discounted fuel card which tracks the wholesale market will be no more expensive and less liable to unidentifiable losses.B
Buy in bulk