You would need to try them in store. I’ve tried a few and not found them particularly comfortable. I’ve got Ercol and have been happy with that. I was in Furniture Village a few weeks ago and came across The Lounge Company which looked nice. The sales person said that they were an offshoot of Parker Knoll and G Plan and made in UK.
IME John Lewis guarantee is worth nothing now, and their customer service awful. I bought a smart TV from them, thinking the 5 year guarantee was good. Absolutely terrible. I would never buy electronics from them, and would seriously think twice about buying a big purchase.