Imi, Horn Cabinets are based in Swindon, why not make contact with them you never know they might have a cabinet that has been to an exhibition that has the odd mark or two on it and will sell this cheaper. Also why not do the rounds of sewing machine dealers that actually stock the cabinets as show models, as often these are sold off cheaper when a model has been discontinued – you never know what you might find.
For maximum use and space, I have a Sewmate II (Koala Cabinets from Australia and yes from Horn in Swindon) and when closed it looks like a neat sideboard, however when open it is huge as the top opens up towards the back giving a huge work surface. I live in a tiny bungalow, the biggest room is 11 feet by 13 feet into a bay, so not a lot of room, but oh it does work and I find having all this extra space behind the machine essential especially when I made curtains, a wedding dress, and I have different plexi’s for each machine – extravagant I know, but I much prefer sewing with the machine sewing area flush with the top of the cabinet. I even use my overlocker set down so it is flush with the top. Also I can move this cabinet from room to room easily myself, and now that my kids have left home I do have a dedicated sewing room.
Good luck with your hunt.