Darn lucky with our digs. We got 900mm twin walled pipes from Hinkley Point C project. About £3,000 worth. Used as inspection pits but for single use only. At Vurley we had 60m of scaffold poles donated. Plus the big concrete pipes for 7m of entrance shaft. They were only in the next field. Look on Facebook Market place for local stuff. Often stuff left over from projects on there.