I will let you in on a dirty little secret:
Most of the R&D guys and gals out there just ain't that good (And there are a huge number of jobs where that is just fine, because it is more product design then research)!
A few tips:
1: Learn at least some mechanical design (And drafting!) skills, knowing how to really interpret a mechanical drawing is stupidly useful, as is knowing when one is just wrong (Horrifyingly common to get something from some solidworks only type who does not understand that setting zero decimal places on the export is not going to result in connectors fitting in the holes, or that tolerances actually matter)....
1(b): Learn at least the basics of a modern mechanical cad package, Solidworks, Pro-E, Rhino, Autocad, Turbocad, whatever, the concepts more or less apply to all of them and it is another stupidly useful skill.
2: Learn the C programming language as it applies to small machines, practically everything you do these days will have some sort of tiny micro in it one way or another, and this can include test jigs, being a hardware guy with competent C and assembler for the likely small cores is a pretty potent combo out there when job hunting....
3: learn how JTAG works in detail, also try to learn the way the commercial tools work (XJtag springs to mind), for a tester being able to make this work well is more then somewhat useful.
4: Learn MATLAB, also (spit) LabView, both a little niche, both in demand that is not going away any time soon for test automation.
5: Get a full amateur radio license, not hard if you are doing a HND, but it still opens some doors (Given how pony the multiple guess exams are now this is surprising but true).
Good luck, I got a £25K gig in Yorkshire on the back of the Ham Ticket and fast talking (more or less), and two years later leveraged that and some old pro audio experience into a broadcast equipment design job in the south east @£40K+, so it can be done even without a degree.
Regards, Dan.