Janet wrote:
Rarely within convenient reach of a BQ so whenever I've bought paraffin
it's usually from a local garage. I have used CH oil left over from when
we got rid of the oil boiler system and it works okay.
Don't know if it helps, but B+Q do a delivery service.
Not to Scottish islands :-) Or even to all rural areas on the mainland.

BQ delivery says

"Delivery is available to all UK mainland addresses."

except the remote mainland addresses where

"Customers living in some remote rural areas should note some delivery
services are either extended by 2 working days, or in some instances NOT
AVAILABLE AT ALL "

In that case, "it doesn't help". Oh well.