Just a follow up on copper sourcing. I checked with Chadwicks in sandyford & they wanted 65 euro for 25 metres but this was too much for my needs. I eventually got 13 metres of 10mm insulated from heat merchants in Deansgrange. They sold it by the meter so no waste. It cost around 35 euro. Had to strip insulation off but it is regular 10mm copper underneath.