I have tried to keep the charging process as simple as possible, and with this in mind, I only charge for my time, not my knowledge, skill, experience or investment in tools. 

Whether I'm pruning a tree, mowing your lawn or fitting a new radiator to your central heating system, the fee per half-hour is the same - just £20.00. With a minimum fee per job of half-an-hour. (Although decent tea & biscuits could be used as a persuader to waive that).