Why do you need to split every individual bill and transaction?
This is how my partner and I do things…
Let’s say all your bills, expenses, food etc all come to £1,000 per month. Each put your share of that into the joint account - so it can be 60/40 or whatever split you want. (do it with a standing order each month for example).
Then use your joint account for all joint spending and setup all your joint direct debits here too. If something that you haven’t budgeted for needs to be bought eg. new bedding. then split this. Doing it this way means that everything is automatically split without all the hassle of repeatedly requesting payments from each other and managing shared tabs.