The effect of moving your contribution into a joint bills account and spending what is left vs everything into a joint account and taking an allowance is likely to leave you with the same amount of money for personal spending, so that's not what you need to look at here.
Of course your DH wants to carry on spending as he likes, but the music is going to stop one day isn't it? And it's quite irresponsible to carry on like that and then he might regret spending every penny he had available to him.
It's also selfish and unfair of him to take a bigger share of the free spending money, for himself, because that's what's likely to be happening here, especially while it sounds like it's you that's boosting the family disposable income by implementing the cost cutting measures you talk about. Why do his wants trump everyone else's?
What are your pensions like? If you don't have decent pensions you're either going to have to work forever, or have a very poor retirement (unless you receive an inheritance or release money by downsizing).
How do you fund large purchases like cars or home improvements? Ideally these should be saved for, so you don't end up in debt.
What if one of you loses an income? Will you be able to pay your bills on one salary for a while?
Do you have DC that will go to university? If so, you will need to contribute hundreds of pounds a month towards this, do you have savings or spare income available?
As for what sort of lifestyle you should be able to afford on £110k, that depends on your essential costs and how much disposable income you have left over. But it's quite likely that it doesn't allow you to spend freely all the time, especially if your wants last longer than the money available.
You could review your budget to see if you can cut any costs to free up more money to save and/or spend.
You could also go through the financial flow chart together which is a 'to do list' for managing your money and starts with setting a basic budget, building in some stability and spending modestly, then when you're in a better place with pensions, savings and paying down your mortgage, talks about spending more freely.
Have a look at:
https://www.moneysavingexpert.com/family/money-help/ and
https://ukpersonal.finance/flowchart/ (just skip any steps that are irrelevant such as applying for benefits or getting out of debt if you don't have any non mortgage debt).