> I'm not a sapper. (British version - certainly not USA >version, whatever that insulting term means).

Sapper isn't an insult in any way shape or form (well, except to the gunners). A sapper is mearly a private in the RE. It all goes back to the when the REs were divided into the Royal Engineers (officers only) and the Royal Sappers and Miners (non-commissioned ranks only).

Regards

Tom