This is a tricky one, prices can vary and quality can too, but if you buy from marinas it’s all pretty much of a muchness and of course you’ll pay a couple of quid a bag more (maybe)
I’ve been budgeting £160 for the month, and that’s worked for me,
We’ve not had a very cold winter, if we had had then I might have had to spend another £40 on that cold month,
but it’s felt quite mild at times and I’ve let the fire out at night and not relit until following evening,
where as when it’s really cold you keep the fire on 24 hours a day.
past years I’ve scavenged wood here and there but didn’t bother this year,
in a nutshell: expect to double your budget for fuel,
oh, you used to able to set light to proper coal easily with a rizzla paper and a twig,
now nothing wants to burn!