Thats basically what they want people to pay ££££ for, dont forget they might give you an old rusty rascal van with it though

Franchising w/c in the U.K will never take off.
Pro
have to say it could ,but not what you are looking it. 
Ian,
Couldn’t fully understand the last part of your post, but think I got there in the end.
Franchising W/C in the U.K would never leave the ground
properly or make it to a scalable and recognised brand for a simple reason,
W/C in the U.K is an age old industry, and like a patch work quilt there are rounds sewn up all over these graceful lands. Some handed down over generations. To 'Move In' build a name, sell and manage a network of rounds in every town or city in the U.K, in the domestic market and on monthly cleans is not just impossible but laughable.
U.S.A its a different story but a totally different ball game, ever heard of Fish Window Cleaning?