The Old Vic

Seats: They're pretty much your standard London theatre seats - tight but doable. Legroom isn't terrible but you'll need to stand up to let people pass, so if you're on the aisle I'd recommend waiting until the lights dim before taking your seat to avoid the hassle. The chair arms are short (e.g. don't run the full depth of the seat) so it can be a bit of a squeeze at the back if you carry your weight in your hips but thighs have extra room. I found it bearable at size 28. Stalls are wheelchair accessible with a ramp vs. stairs. I noted there's a step-free side entrance. I did not manage to check out the toilets so I can't speak to their accessibility. It's a gorgeous venue!