I don't think so.
In the early 90s the RN fiddled with the branch structure and introduced the Operator Mechanic branch. I was a Weapon Engineering Mechanic (Radio), AKA Pinky Faggot, and remained in that branch even though it was gradually run down and replaced by OMs. During this period the Artificers remained but it was with the introduction of the current Engineering Technician branch that tiffs were done away with. ETs are essentially a mix of the old WEMs and the tiffs (and the same goes with the Marine Engineering Mechanics and Marine Engineering Artificers)
Give it another 15-20 years and they'll fiddle around with the engineering branches once again.
@PiddlingFish if you complete your A levels I would go with @Ravers' suggestion of applying to become an officer. Whichever way you decide to go in your military career you will one day leave and seek civilian employment. The knowledge, skills and experience you will gain as an officer will only be to your advantage when competing for your desired job in a future civilian career. Plus, as an officer, get dicked around a lot less and enjoy greater privileges than an Other Rank.
You've stated that you are interested in a combat role and have listed the infantry as one of your primary choices. In which case I would suggest you don't join the RN as there will be few opportunities to play with bangy things on a regular basis. You certainly won't do so as a Warfare Officer but you will command those that do plus as a Warfare Officer you may have the opportunity to command a warship which is a hell of a lot of responsibility.
As a warfare branch rating you will spend a fair bit of time in the ops room but when not there you will be doing shitty jobs like cleaning and painting or standing at the gangway controlling access to the ship. You will spend a lot of time in various shifts (known in the navy as 'watches' and these will fcuk up your sleep pattern.
The Seaman Spec branch will see you getting to drive sea boats (not that much fun when it's pissing down with rain) and carrying out seamanship specific evolutions such as replenishment at sea (RAS), bringing the ship alongside or leaving harbour where a lot of rope handling is required (often when it's pissing down), anchoring (often again when it's pissing it down) and lots of upperdeck maintenance like cleaning and painting (although if it's pissing down you get to clean and paint inside the ship).
As @P.O.N.T.I says, avoid the infantry because truth be told when you leave the army civilian employers in the main aren't really interested in ex-soldiers whose main skill set is digging shell scrapes, living in muddy fields and pointing guns at and shooting people.
Have you considered a role as a Royal Marine?
Plus, as Ravers has said, the army smell funny and eat their own young, added to which they are particularly attractive to members of the same sex, unlike the men of the navy who have a girl in every port (and the odd kytie here and there).