Cool - this is good context. Are they "highest rank" in terms of overall academic achievement? Is it specific to digital art? Is it specific to games? How about employability rates in relevant fields as a postgraduate?
I would probably drop at least UCA from my list with the context of your previous course given they are primarily a conversion masters.
No course will help you "get a job"- they may help set you up with good connections, they may allow you to build a great portfolio, but there is a huge degree of presumption when it comes to these kinds of courses and the fact is they can only ever set you on the right path and a huge amount of being successful in finding a role is self-initiative. You can be a great artist and flunk every interview and I know 'cause I've seen it. Succeeding in finding a job in games is about repeated exposure to failure and rejection until you become immune to it 🙃
In my experience, a lot of "good" (i.e. high academically rated) universities have started offering games courses within the last five years. This is because they have seen that it is a desirable job that people want to do and that applications to games-related courses are very high. It makes the university a lot of money. Did you look at the thread I sent? It does have some further insights from people who work in academia (which I do not).
Herts, Staffs - we are talking universities that have offered games courses for a lot longer than other places. This means they have more successful graduates, more graduate work to showcase, more resources, more established ties to industry and often longer-standing academic staff (so with more teaching experience and more experience helping people land their first position in industry).
Escape is a slightly different case being a newer university, but they are highly specialised to the industry - they have worked really hard to integrate themselves with strong industry connections.
Something else you can try... Look up your favourite UK games companies on Linkedin and tab to "People" - it will give you a list of the most common places people studied. A) this will likely back up (at least some of) what I said and B) it may give you some other universities to consider that you perhaps haven't already. Out of curiousity I did this for my own company recently (a AAA studio in the UK) and it features my university at #2, but Staffs and Herts feature in the top 5.