I went to a friends who has just bought a cottage in a village where the power is distributed overhead on poles by means of 4 uninsulated conductors which are fixed one above the other in a vertical manner. They are quite common round here & would not usually give me cause for concern, but in this case, because the cottage is on a hill & the way the garden has been terraced, there is a point where the cables are approx. only 4 metres above ground level as they cross his garden. I also noticed an aluminium flag pole(about 4 metres long) laying across the lawn at this point & advised my friend to move it immediately. However I was not sure if there is a minimum height that this type of distribution can cross a domestic property & would appreciate any advice.