cheers for the answer.
I know there will be many factors that will influence this but I gave a description of what answers should be based on at the begining of my post.
I deffo agree, this isnt going to be started as a full time business. I will be aiming to start a part time round initialy only a few days per month to get a better feel and understanding of things.
If I feel I can expand during the summer that will be my starting point, I have experience running busineses so have a general understanding of how to evaluate whether wether something can give me a wage.
A few years back I left a decent career that was only going to get better for me (financialy only) and left to get a job where I could be happier and spend more time enjoying life.
I did this but, I now work for someone else renovating properties and I hate the way I get treated and undervalued and now know that I realy need to be self employed and answer mainly to myself.
Im hoping window cleaning can pay the bills, I dont expect to get rich.
Oh, by the way... I actualy know a guy up hear who started off as a window cleaner and moved on to better things making millions and losing millions, he now own a succesfull business, employs about 30 guys and is once again a multimillionaire.

so keep dreaming guys, they might come true. AIM high you may go high etc, etc
any more comments welcomed