One pack of flooring underlay – never used. Says it will cover 9.8 square metres. More info on the photo of the pack.
https://www.sourcewoodfloors.co.uk/techni-board?srsltid=AfmBOoooI01RCBd_0fHsz_juFgYIeCrVUemWL41bvKwvQ7hkKVh24Z4X
Near Winchmore Hill station, N21