What, if you don't mind me asking, is the quota on that GBP30/month plan and is that the data you get with your mobile plan, or is that "mobile broadband" which is , at lest in Norway, priced quite differently at least on 4G and 5G is beeing rolled out slowly as we speak (corrent plan for both nation wide MNOs is ens of 2022)
No quota on this plan. It's unlimited data, and not speed capped. Just an ordinary phone SIM that I put into my own 5G router.
I don't think there is any real distinction between "mobile broadband" and "mobile data" SIM cards in the UK these days. It used to be that some cheaper plans had tethering restrictions etc, but you don't really see that anymore. But if you get a "mobile broadband" plan (not just a SIM) then it typically comes with a mobile router included.