I need some for my stove, between leicester and Luton, cheers
Try j23 truckstop they should have some, only a little shop by pumps.
Also services garage shops.
Maybe pricey but needs must etc 
Also Stobarts Rugby truckstop on A5 near Rugby
Ignore J23 it means going North I always get confused with North and South. Wife said ‘go South on me’ once I ended up licking her forehead.
Anyway Rugby truckstop best bet.
Cheers dipper Dave, got the wife to get some from Rugby trucks top, she’s glad to have a reason to leave the house!