Good question Len
Sheets of plywood, half used rolls of electrical wire, large offcuts of hardwoods, mahogany stair handrails, perspex, sash window lead counter weights, 10-15-22-28mm copper tube, plastic and steel trunking, rubber door seals, tins of gloss paint, copper-brass-lead sheet offcuts, unopened reams of photocopier paper,
It might sound as though I spend my life hunting through skips but I used to manage large construction sites and its amazing what the sub-contractors and clients employees will throw away. On one occasion when constructing a new office block the clients IT manager asked if they could put a few things into a skip, they came out with 30 computers that were only 3 years old.
Paul