This is essentially the same as the EU laws. However, my experience in the UK (pre-Brexit) is that these kind of laws are commonly ignored, For example, the same (EU) laws require that the full price is always displayed up front and that you can't tack on costs later. But e.g. ebay.co.uk has it hiding behind some link with some misleading language that makes it appear as if selling stuff is free (it's not). None of the other EU ebay.tld sites had that when I checked at the time: they always displayed the price on front.

I also had some other service where they advertised a particular price, and after filling in my personal details to order the service there was suddenly an extra mandatory charge which doubled the total price. wtf?! This was 100% illegal. I stopped as that was too much for me and they even had the guys to call me out of bed in the weekend to try and sell me their stupid stuff. I gave an unfiltered version of my opinion on that.