Very nice site mate!
Apart from your customers who use it to pay you do you actually get any inquiries from the web?
Thanks, the site was designed by my wife, who had never done one before.
It's been a while since I did the stats on web enquiries (been working on a 43,000 leaflet drop to go out in October so other stuff's gone on the back burner). Yes, I get quite a number of enquiries from the web. They come either via Google Adwords (work it right and it's VERY cheap) or they come via one of the online directories. They have already seen my prices before they call, so they only call if they want to pay my price, which means 100% of my calls turn into customers.
On topic, the point here is that you can charge anything you want, within reason. If you're talking about existing customers, put yourself in their shoes. Will they drop you for an x% price increase and risk not having a cleaner/having the usual twit who will come once and never be seen again? If they are new, they probably don't have a cleaner, so asking for a quid or two more is hardly going to make them decide "no" provided you look like you're going to look after them.
Vin