Varies enormously. Last month: pretty much spent nothing, was too busy to spend any money, and was volunteering for a week all expenses paid so saved money on food too. Did not go out anywhere other than where I was treated (1 evening meal), no coffees out, no meals out, no takeaways (I don't like them), no clothes needed, don't buy make up, do my own hair cuts, don't belong to any gym or do classes of any sort. September was not dissimilar on lack of spend, but I did buy a pack of socks and a belt (£22, trousers falling down due to weight loss).
This month is the opposite: motorbike needs some bits, which will come to £2-300. May also buy tyres (another £200+) and I've some stuff for another bike to pick up from the paint shop (£5-600), I'm out for 2 x brunch, 2 lunch, 1 afternoon tea and 3 evening meals all booked in so far and expecting more, and I'll likely spend a couple of hundred on Christmas presents, and I've spent £8.50 on a really nice jacket in a charity shop (it also said 'dry clean only' on label, but given it's mostly polyester it got turned inside out and hand washed - came out fine), I also have a basket of stuff at Joe Browns I'm debating on buying (£200), I do need stuff for going out, as I've shrunk in weight and I've nothing smart that fits well for a posh Christmas afternoon tea. I'm going shopping in London (will take train I think, parking is as much as the ticket!) to a specific shop for something (£50ish) and meeting a mate for lunch. Also I ordered a replacement blade for a mixer (£17), which I don't really need as such as I've alternatives, but it's handy to have.
On average it's never anywhere near as much as this month! I rarely buy clothes.