An intersting post!
I think that people often imagine that window cleaning is less complicated than it is. As I see it, you have several problems which may be based on some misconceptions about window cleaning, but most of these are not big obstacles.
Firstly, you want to employ someone to do the work for you. I'm afraid that you'll probably find this quite tricky. Window cleaning is not an especially difficult business to get into, and most people who want to be window cleaners do so because they want to be their own boss.
As you have seen, good window cleaners are in huge demand almost everywhere in the UK, and there is no shortage of work for those who are prepared to get out and drum it up. This is bad news if you want to employ someone, because there's no advantage to working for someone else over being self-employed.
A simple solution to this problem : why not do the work yourself? Although window cleaning has traditionally been a male-dominated industry, with the advent of pole systems more and more women are taking on the job. I know of several ladies who are very successful window cleaners. It's not difficult to earn in the region of £20 per hour, and you'll find that customers will really love having a female window cleaner. If you build up a successful little round, you can sell it when you go off to University for a nice lump sum.
If you don't much like the idea of going up ladders, you could get a small pole-system. This is a kit which allows you to clean windows from the ground, (with no ladders) and is becomming very popular in the industry.
I would caution against buying a round at this stage, as you are new to the business and may not really know what to look for. Its quite common for rounds offered for sale to be a bit of a rip-off. Canvassed work will always be better than bought work anyway, and of course costs you nothing!
-Philip