Agree that what is reasonable for you depends entirely on what your incomings and essential outgoings are.
If you're aiming towards financial responsibility, all those things you mention come way down the list after basic bills, work travel, DC expenses if you have them, pension, any debt repayments, food, savings for annual and irregular expenses such as insurance, broken white goods or cars if you drive.
Savings in case of loss of income, or if you want to move house as you mention 'not being able to progress on the property ladder'.
Obviously, how much this matters depends on the suitability of your house for your family. Eg if you are a family of 4 with opposite sex teens in a 2 bed house, you have a lot more reason to need a bigger house than if you are a couple with no DCs in that same 2 bed house.
Basically you should be covering all your essentials as mentioned above and then what is left is what is a reasonable amount to spend on the things you mention, split 50/50 with your partner if you have one.
As far as beauty treatments go, I've no idea how anyone can be arsed to go for £70 worth of beauty treatments every month for a start. I probably have my eyebrows threaded once or twice a year, don't wear make up and just pick up basic moisturiser, face wash, shampoo etc in the supermarket.
But I spend what is probably a ridiculous amount on holidays, so it's swings and roundabouts.
Using cash to control what you spend might work, or you might want to try moving your £300 or whatever you decide on into a separate account, with no overdraft, to use on a 'when it's gone it's gone basis'. Something like Starling or Monzo offer such an account and it will categorise your spending so you know how much you spend on beauty, eating out, clothes etc without having to work it all out or write it down, which sounds a bit tedious.