HGV licence - I suspect that one's going to be tricky for a few months till you've got the records, and you do need to do a lot more than you might think.
Car licence - there's a bit of potential for confusion there. You're definitely allowed to tick the "I've had a hypo" box - if you're T1D and you haven't, then there's a good chance you've not got awareness or are just running too high all the time. Some people (fortunately not you
) think it's a good idea to fib and not tick it - this isn't a good plan.
If you've had more than one hypo while awake requiring help from others, no driving. If you've got no hypo awareness, no driving. But neither of these things sound true.
Have you ticked a box you shouldn't? There's no need for text on the form - you said "I have stated that I have had a few hypoglycaemic episodes, non requiring intervention, but just simply cases of overexcersion maybe, that I felt coming on, and dealt with (Maybe I am being too honest and they are not actually 'episodes'). I think they have taken this too literally and think that I am regularily on the verge of collapse - which is no where even close to the case" - did you tick the "Severe hypo" box and try to explain it? That's a mistake, and like ticking the "I am a terrorist" box (
https://www.bbc.co.uk/news/uk-scotland-45678517), even if accidental, it's going to take a while to sort out. Severe = help from others. Crashing to vagueness, sweats, all the other things aren't "severe" if you got yourself out of it - that's just normal hypo in DVLA terms.
What I'd do is contact Diabetes UK. They've got people who can help with this - if there's been a mistake, they know how to work the system. The very bad news is you're not going to be allowed to drive for a while while it processes - I'd expect at least a couple of months. Which is a complete pain in the rear, and you won't be able to do the road tests or commute by car. Just as the lady in the story mentioned above had a massive amount of hassle from a simple mistake, I suspect you're going to have a lot of pain from yours, and there's no easy way out of it :-(