@Simsprincess80 Without knowing for sure where you're shopping, it's difficult to come up with a good list of recommendations. But since you mentioned Currys, this laptop is a good place to start, at least. It's £600 (silver) or £630 (black), it has 16 GB RAM and 512 GB storage, plus it has a very nice screen.
https://www.currys.co.uk/products/asus-vivobook-k553-15.6-laptop-intel-core-i5-512-gb-ssd-silver-10224577.html
https://www.currys.co.uk/products/asus-vivobook-k513e-15.6-laptop-intel-core-i5-512-gb-ssd-black-10224714.html
The downside, although it's not fatal, is that its RAM only runs at 3200 MHz. The Currys product page doesn't mention this, and, oddly enough, neither does the Asus product page. But if you google "Vivobook K513E," you get plenty of results, for example this one:
https://www.notebookcheck.net/Asus-VivoBook-K513EA-L512TS.584805.0.html
Some site or other will have the info, although you'd still have to double-check to make sure you were looking at the exact same configuration as the one you were considering buying. If you're in-store and can see a floor model, it's even easier: bring up the Task Manager, click the Performance tab and then the Memory section, and you'll see the speed listed on the right. The laptop's box should also list the specs.
But this isn't a huge deal, just a detail that can have a small impact on performance. If you find a laptop you really like for other reasons and its memory doesn't run at a high clock speed, it's likely you'll still be happy with it.
As far as other options go, there are a number of laptops with this kind of hardware that should all perform within a few percentage points of each other. So it's fine to choose based on other details, for example maybe you'd prefer a certain size screen or you want a number pad on the keyboard (or you really don't want one). Long-term, those details will probably matter more to you than a few extra framerates. So I guess what I'm saying is that memory speed is a useful metric if you're looking for the best performance, but it's not worth sacrificing anything else.
By the way, while 16 GB RAM is nice to have, it's not critical, and most laptops are upgradable after the fact. So if you find the otherwise-perfect computer that only has 8 GB, or the 16 GB version is £200 more (as is sometimes the case), just remember that you can buy more RAM for around £40 and either install it yourself or pay a computer shop to do it for you.