It depends on the subject and level being studied at.
Strathclyde has an exceptional track record in undergraduate engineering, placing it's students in top engineering firms regularly; although "general" league table rankings don't usually reflect this, given engineering (well, broadly STEM but mainly engineering) is it's specialty it's maybe not unsurprising (similarly for Heriot-Watt). Loughborough is actually somewhat similar, having a very good undergraduate engineering programme with a lot of links to industry. It also has a lot of strength in sports science and (maybe only some?) in the creative arts - I think the former has a research presence there as well).
That said, while at undergraduate level they're probably decent enough choices for physics, I'm not really aware of them from a research perspective (which is what would probably be more relevant for an MSc, assuming you plan to continue to a PhD). For a masters in physics, you'd probably be looking at the top being Imperial/Oxford/Cambridge/Edinburgh (in no particular order, and including the MASt Mathematics/Part III Maths at Cambridge) generally, then more widely after that Brisol/UCL/Glasgow/Manchester/Birmingham/KCL (again in no particular order, although NB I'm not sure if all/any of these offer a taught masters).
Other places might be relevant for particular areas of research (Surrey has some focus on radiation physics for example as I recall), and both Strathclyde and Louhgborough may well fall into this category (L'boro for example might well have some presence in e.g. biomechanics related to it's sports science research, and Strathclyde might have some stuff in applied physics relating to engineering areas like materials/fluids/environment type stuff; this is speculation though).
Global university rankings tend to be a little skewed in perspective because in essence the top ~200 are "top 1-5 universities in each of 20-30 countries). That doesn't mean others are bad per se...also they often focus a little more on "house names" and so some universities are less well known internationally which are quite strong domestically.