On janaury 1st ever year, put your price up by a least a £1.00, always blame it on the goverment (fuel costs-road tax ect ect), because this is your first year you can put the prices up to what they should be.
If you go door knocking, between now and christmas, you will have at least doubled the amount of customers you have now, but they are priced correctly, so if any of your older customers cancel because of your price increase, you are not out of pocket.