British weather guarantees your garden furniture's getting pelted with rain half the year whether you like it or not. Cheap stuff falls apart by the second summer and you're back shopping again wondering why you bothered. You could look at a lounge sofa set, for example here:
https://rengard.co.uk/...ts/lounge-sofa-sets/ . They've got sectionals that work for different garden sizes and cushions that don't turn into soggy messes after the first drizzle. Proper spot to settle in with mates or just sprawl out with a book when you fancy some peace.