Frio wallets keeps insulin cool. They are not cases for diabetes paraphernalia such as meter, needles, lancets, test strips, etc.
If you google “diabetes case uk” there are lots of options.
Personally, I do not use a dedicated case. I use a Healthy Back Baglett. This is big enough for two insulin pens, meter (without the case ... I don’t need a case within a case) test strips, lancer, there is a pocket needles and lancets and still room for a credit card, mobile and house key.
If you want to keep your insulin cool because you are going to a hot climate, a two pen Frio wallet fits in the Baglett.
Mine came in one of these, enough space for a pen and extra needles. When the zipper broke I called Novonordisk and they sent me 2 new ones, I even got to choose the color. So give them a call and they may help you
I used the hard case which came with my novopen for years - 3 needle slots, pen and a spare vial slot. But I think it broke, so now everything is a bit more loose - the pens are robust enough to live in whatever bag I've got with me, I've always got some food too, and I either pack my plastic pot with spare needles or put a couple in a camera case.
Look in the kids back to school section, there is always a wide variety of pencil type cases, big and small with all manner of little compartments and hidey holes. Cheap too.