Me and DH used to spend frivolously on Chinese takeaways. Two a month. (Occasionally we would have an Indian one.)
Cost us £13-14 a time. Hardly had any during the pandemic as they were shut a lot, and by summer/autumn 2021, the same takeaway had gone up to £19-20! Ditto fish and chips. Used to have it from the chippy 2-3 times a month. Cost us £6 or so. Now gone up to £11.
Extortionate!!!
We now get 4 fish from Aldi for £2.25, and a bag of chips that has 10 portions for a pound, and 2 pots of Harry Ramsden chipshop curry sauce. (2 for a pound, and each curry sauce feeds 2.) SO for roughly £4 we get 4 meals (2 each obvs) instead of paying £22!
Can't replicate the Indian and Chinese takeaway, but we only have one every month now. Sometimes we will leave it 6 weeks.
Also used to spend silly money on the pub and meals out. Would never spend that kind of money on such things now. We go to the pub occasionally, and for a meal too occasionally, like 5 or 6 times a year each. But we used to go to the pub 2-3 times a week, and a meal out once every week!
Oh, also, like some other posters, I used to spend around £10 a month on magazines. Only spend that on magazines in SIX months now.
AND I used to spend £40-50 on blonde highlights, once every 8 to 10 weeks! I have done it myself for 12-13 years now. Looks just as good, and my hair is in nice condition... Even though hairdressers tell me it's TERRIBLE for my hair if I do it myself! (Terrible for their business more like!)
OMG the money I have squandered when I could have done it myself, and/or found a cheaper option! 
I have also spent a lot on travel and holidays over the years, but I don't regret a PENNY spent on that! 