You need to make your mind, you are either going to run a window cleaning business or carry on with your employment.
With any business it is the first 3 years that are the hardest, so if you leave your job and security it offers, you will have to tighten the belt and cancel the yearly holidays abroad.
But this is only for a short time, soon you will be surpassing what you used to earn and the quality of your life will improve.
Do not worry too much about the winter, you can still work, try to get some inside work likes hotels - pubs and resturants etc, these you can do in any weather conditions.
I would never take on any work unless its minimum charge was £10 and double for a 1st clean, you might feel this is to high for your area, but it is achievable, you need to sell your services to prospective clients to justify the high price you are charging.
The way I do this is I point out that I clean all the frames - vents - sills and glass on every clean, I always telephone or text the night before, and if the client is busy I will work my round around their diary, so if tommorow is impossible maybe another day in the week will be good for them.
Make you customer feel special, they love it and are willing to pay for it as well.
You will still have some who say my last cleaner only charged me £5, when they say that to me I point out that they are no longing cleaning windows and would they be prepared to work for so little.
