It's not just the qualification that opens doors, it's the knowledge and capability. If you are working in one sector of industry, you will probably forget 75% of everything you learn on a degree / HND course over time. But the bits you hang onto, especially the maths and pure theoretical material that never goes out of date, will enable you to pull rabbits out of hats on cue whatever field you work in. Many of my customers don't give two hoots what qualifications I have, so long as I design stuff that works well and solve their problems efficiently. This I could not do without what I learned at university 20 years ago, even though much of the technology has since changed radically.
I've always enjoyed the craft aspects of electrical work and that is why I still pick up tools on almost a daily basis rather than just sitting behind a computer. Having a trade and a degree qualification that complement each other is a very versatile combination. Many engineering graduates have limited or no crafts skills and have no ready fallback within the industry if their chosen branch of technical knowledge happens to go out of fashion.
If you plan to do a higher level electrical engineering course, start polishing up your maths in advance. Much of electrical engineering is maths, IIRC in the first year we were getting 6-8 hours of maths lectures per week. You need to go in with A-level maths capability and you will come out able to solve many kinds of second-order differential equations in your head. A spark who can do this will be a better spark!