The UK actually has a bunch of 'challenger banks' that are doing cool things like this.

I use Monzo which, a few month ago added support for 'Pots' - super lightweight mini bank accounts that let you partition up your money. Among others, I have a Holiday pot and a Savings pot. They even have this early stage feature where if you name a pot "Coin Jar" they'll automatically round up transactions to the nearest £ and transfer it to that pot.

Using something like Monzo is like night and day compared to the products from the big banks.