Some dodgy assumptions in here, 'It's not an HGV' doesn't mean you wouldn't need a C or C1 licence!
As you passed your test before 1997 your main entitlements should be B (car), B1 (quad bike), B+E (car + trailer), C1 (small LGV), C1E (small LGV + trailer), D1 (minibus) and D1E (minibus + trailer), plus A if you ride a motorbike. The combination of B, B1 and B+E allows you to drive anything up to 3500kg with a trailer more than 750kg (train weight limits apply). C1 is the magic one as on its own it allows you to drive anything with a Maximum Authorised Mass up to 7500kg - as you have an older licence you should have information code 107 on it which allows you to drive up to 8250kg.
It's the MAM as per the V5 that makes the difference, not whether or not it's a goods vehicle - per the rules our Bedford isn't a goods vehicle due to the permanently mounted engineering equipment, but you still need category C as the MAM is 9650kg. It's very much worth making the distinction as some of us aren't lucky enough to have passed before 1997 so we only got B and B1 when we passed our car tests! :police: There's absolutely no grey area as the licence categories are very rigidly defined - PC Plod will be looking at the V5 details to tell if you're in the right or not.
Answer: I can't drive a Saracen on my licence, but you can. Tony B will be along in a minute to fill in anything I got wrong
Stone