I was thrown for a minute about what on earth an FdSc is… Foundation degree right?
I’m going to read between the lines a little
This is probably a good idea, frankly… I don’t know anyone who values a foundation degree, im not sure why someone thought it was a good idea to make them a thing. Even our apprentices in my old work considered it a joke and all aimed for full degrees so they could get a graduate job. millage may vary 
, it seems to be an English thing, but i’ve never seen a security job with a foundation degree as a requirement (if security is an area you’d like to go into)
Generally if you’re on a good degree course, a consistent full education path will serve you far better in the long run than one that’s broken up and jumps about. though its odd that you’d go from a cyber security course to just a generic computing course if you continued on with the topup year… can you not do a security focused top-up?
Which speaking of. What are you interested in? What is you’re degree focused on? Why are you considering not continuing?
If the security industry is an area you’re interested in the possibilities are quite large and varied and you can get out of it what you put in, ive seen all sorts of career paths including myself. (put it this way if money is a motivator, £75k in less than three years is not unachievable).
No.
If i can give you just one piece of advice it would be this, do not squander the time you have. First and second year may be easier but third and fourth (do you do 4 in England?) you need to put the work in. Not just for course work (that doesn’t matter as much except to show you can actually do work on time) but to learn everything you’re interested in and everything in the area you’re interested in. You don’t need to know Juniper or Cisco commands, you do need to know networking concepts and protocols. This applies to everything, software doesn’t matter, how things work does. Fundamentals of networking, crypto, attack frameworks, defensive and offensive technology concepts are more important that knowing how a specific IPS works. Being able to write.
Having sat in interviews and graduate assessment centres i can tell you that its really easy to spot the ones who didn’t put the work in at uni and the ones who did. and you can guess who got the jobs.
Depends what you’re doing