We have Mobilcard which gives us something like 0.06c/l off and Shellcard which gives us something like 0.03 or 0.04 c/l off, so we use either one of these.
Then, when I shop at New World I keep the 0.10c/l off voucher for BP and use that (and sometimes it is even 0.12c/l off)... but there is a grumpy old fella there, so I'll be avoiding the place when he is on the forecourt.
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