is it that bad an overhead... £2-£3 a day, your work load should increase by at least a third now that you are on the pole so you have it covered already, my standing supply charge is £35.00 and sewerage £50 per month and thats filling up a 300l tank!! again i need to take personal use out of that (family of four). every business has overheads, just cost it in, all the bother you are going to have trying to source your water away from your home...is it really worth it. Just my opinion.