Agree that percentages are meaningless because they look very different for low vs high earners, or due to what your true fixed essential costs (ie the basic minimum, rather than the 'nice to have' version of housing, cars, mobile phones etc) are vs your income and probably other factors too.
However, you might want to review your approach a little as it doesn't make sense to pay credit card interest and have savings at the same time, unless your credit card debt is at 0%, but you also say you've been saving for many years, but keep taking money out of your savings, so it sounds like you may be overspending/not focussing on your goal to buy a house if don't have a deposit yet.
But is buying a property a realistic prospect in the next few years, ie you'll have a deposit and will qualify for the mortgage that you'll need on your income?
As for the percentages:
50% bills - have you reviewed these regularly, can you live somewhere cheaper, are your bills the lowest they can be? If you reduce these as much as possible, it frees up money for savings and non essentials. But even if you don't move, you might be able to cut some costs if any of your bills are higher than they need to be.
5% food - this sounds quite low, are you sure this is all you spend? I'm assuming you live alone and are only feeding yourself?
25% savings (been saving for a mortgage deposit for many years, mainly because I do into savings a lot). How much have you saved? If you keep taking money back, it means your budget isn't working, or that you may be over spending. You could have two savings pots, one for your house deposit, that you don't touch, and another for annual/irregular expenses that you can dip into.
10% holidays. I agree that this sounds like quite a lot, and will be slowing down your ability to buy, but without figures, it's hard to say, but I'm guessing that you earn around £2-3000 pm, based on your bills and food percentages, which would mean you spend about £2400-3600 per year on holidays, could you reduce this a little?
10% for everything else (clothes, house stuff, presents, gym, social life and hobbies, etc). Again, is this what you spend or what you think you spend? It's probably an OK amount but taken alongside your holiday spending, it could be quite a lot of money, especially if it's actually more than that because it's also funded by what you put on your credit card and then pay for out of savings.
You don't mention any travel costs, are these included in bills? Likewise any healthcare costs, dentist, optician, prescriptions, also haircuts etc.
There's a financial flow chart that you might find helpful.
https://ukpersonal.finance/flowchart/
For help in setting and reviewing your budget, have a look at Moneysaving Expert
https://www.moneysavingexpert.com/family/money-help/
They also have a good first time buyer's guide to mortgages and house buying
https://www.moneysavingexpert.com/first-time-mortgage/