I hope all works out whatever you decide to do, Gavin, and that your Missis gets well soon. Window cleaning isn't for everyone and if something better, more interesting came along, I'd probably jump ship too. I'm happy to be either I think, in the right circumstances anyway.
Unfortunately I'm caught in the 'money trap', no matter what I went for, it wouldn't pay the same as what I do now, and not only that I work with Wor Lass who is more than happy to continue window cleaning. She feels she has more control over her life being self employed, than being employed, and she wouldn't work alone, so it looks like I'm in it for the long haul.
Good luck, mate.