I really like the site.
Simple and to the point.
I would replace the weather report with some good pictures of you working in a uniform or of your van etc. That will add a bit more balance with pictures and text and cheer it up a bit.
You need people to see the site, so to get more visitors I would buy another domain name which includes the keywords people are likely to type in Google if they are looking for a window cleaner in your area.
So i would register
www.windowcleanerangus.co.uk for example.
That will likey get your near the top if anyone searches for
window cleaner angusIf it doesn't make top slot, then get links to your site in as many places as possible, give it time and it will climb the rankings.
if you do change to another domain name, just put a redirect on the old site to the new site.