Hi Wozza

I'm in the UK too, and I've tried several things, with varying success. Plain white vinegar will do the job, although it might take longer than overnight depending on how bad the rust is. I've had things soaking for close to 3 days to get the rust off, but it works.

If you want something faster and more reliable, this is the best I've found (that I can get in my local shops) so far: HG rust remover https://www.housemakers.co.uk/rust-r...hoCq6cQAvD_BwE

You'll need to wear gloves (and goggles if you're sensible) and be mindful of how you dispose of it, but it works a treat, and is only about £7 per litre. You can dilute it 5 parts to 1 for soaking, or just paint it on neat to larger items. For frames, I wrap paper towels around the rusty areas, then paint neat product on to soak the towels. A bit of a faff, but since I have no way to safely soak a frame in this stuff, it works.