Having bit of a nightmare, existing external water service is in lead... it burst underground somewhere and i need to relay the supply.. Water board said they will do connection in road but i need to do the works on private. Anyway there a boundary retaining wall, i want to come up the face of, the water board have told me it is possible to buy WRAS approved trunking to take the 25mm MDPE pipe up the face of a wall, it all insulated to correct std... question is where can i buy this? has anyone used it... Thanks in advance. 
