Thanks very much guys, appreciate your no-nonse words of wisdom and I agree this hobby comes at a cost of self-loading at times! Let me read up and digest, but I intend to ask for a refund. We collect there objects for the emotions that they evoke and fakes/repros have no space in that realm - I don't need any fancy wall decorations to impress guests!
I bought these from a very respectable and established antique business down south, and the guys were lovely and there wasn't any hard sell involved. It was me who was a bit excited at the sight of such a substantial WW1 kukri esp with ISD stamp. So this I think was a case of them probably not knowing this wasn't genuine (call me naive!).
I'll keep you guys posted!