This forum caters to poker chip
enthusiasts, who are looking to collect the very best poker chips you can get.
If you're not specifically interested in getting
very nice poker chips, then almost any chips will work just fine to play games with. The ones you linked to are fine, but then so are plenty of others in that same general range of quality and price. Look for something with a design that you find attractive and at a price point that you consider affordable. You'll be happiest with chips that are denominated - you'll probably have a hard time finding any that use a £ pound symbol, but you can get some that use $ dollars and treat them as pounds, or you can get some that have numeric denominations but no currency symbols.
Search on
Amazon,
eBay, and Google for "poker chips" and you'll find a wide array of designs, available from a variety of online retailers. Finding a source that will ship to the UK may be more difficult, but they're out there.
You'll want to give a little thought to what breakdown you need, i.e. how many chips of each type of denomination to get. What works for poker doesn't necessarily work well for blackjack, and vice versa. However, since you'll be buying relatively inexpensive chips, it won't hurt too badly to get more than you need for either game. Use this google search to find posts on PCF that talk about ideal breakdowns for blackjack:
https://www.google.com/search?q=site:pokerchipforum.com+blackjack and check out this post for some guidance on breakdowns for poker:
https://www.pokerchipforum.com/threads/new-members-start-here.85303/
If, on the other hand, you think you want to pick up a new hobby of
collecting top-quality poker chips then read that new-members post I linked to just above and be prepared to spend more time and money than you had ever imagined you would on poker chips. I don't recommend it, but if you do it anyway, well, then, welcome to the forum!