This has always niggled me … I’ve done very many building projects (2.5 houses, many paths, walls, …) but over here (16 years) it is getting too hard. Simply - why are french sacks of sand, cement … in 35kg sizes? I think lime might even be in 40 or 45kg bags. But in UK there is an ‘EU regulation on weight’ (well, not any more, but a carryover) of 20kg.
It’s always seemed to me that one of the main probs leading to the brexit vote was that Britain always adopted EU regulations, causing ridicule and annoyance, but other EU countries pleased themselves.