I live in London and earn £34k with 2 DC. Mortgage, council tax, utilities, home insurance account for two thirds of my take-home salary. That's before commuting costs, car costs, and everything is going up.
I budget to the last penny for everything. But, travel is very important to me, so I put away £100 a month towards our holiday. For everything else it's as low cost as possible or free. So second-hand clothes as much as possible, picnics if we go out. I use my Tesco clubcard credit card for as much as possible, pay it off every month.
I traded in my clubcard points to pay for the Eurotunnel and am taking my kids camping for two weeks. My holiday pot was supposed to cover the campsites, days out, hopefully a meal or two out and petrol. I don't count supermarket shopping in the holiday budget because we would spend that anyway and will eat simply. Rising petrol costs will most likely send me over budget, but I would rather cut back in every other area than not have a holiday.
If costs keep rising then next year we will do it more cheaply by staying in northern France (less petrol) and only staying on municipal campsites. Last time we went abroad was before covid and I was on a much lower income but one campsite we stayed on was only 12 euros a night for the three of us.