I would worry less about the name of the university and more about
a) the likelihood that you'll get a decent grade in your degree, and
b) the applicability of your degree studies to your industry.
Point b) is all about choosing the right course, and an advantage you have as a mature student is that you have a good chance of understanding the relevance of one course compared to another - they're all different, and it is a case of which one will work for where YOU want to be in a few years time.
Point a) is harder. If the Uni takes you on in Year 2, are you going to struggle because you've missed subjects the other students have done? For example maths can be a particular problem here. You may (in fact, almost certainly will) find you end up with a better degree grade by going to a Uni that starts you in Year 1. But, assuming you don't have infinite money and time available, you may actually find you have little real choice, in which case you need to make sure that the Uni you choose is experienced in converting HNC to degree and has a sensible plan for remedial and catch-up programmes. I have to say that a few years ago we put several of our ex-apprentices through exactly this process (HNC/D into 2nd year of degree), and generally they did very well - sometimes extremely well - but they did find it hard work.
But back to your original question, the only cases I have come across where the Uni name may make a difference are where you plan either to leave engineering and get a job in the city or to get a job in a contract research organisation. My impression is that for 99.9% of graduate engineering jobs the important points are just to get a good grade in a relevant degree.
Andy Millar CEng MIET CMgr MCMIhttp://www.linkedin.com/in/millarandy
"The aim of argument, or of discussion, should not be victory, but progress." Joseph Joubert