Well update...
I took my bay sourced used fob ( Omron G8D 382 H-A for my 58 FRV ) to a Honda dealer for reprogramming and he could not encode it to the immobiliser and this is the biggest Honda dealer in London!!!
Can any of the autolocksmith programme Honda key - or may be I should try...
Thanks ,will get auto lock smith to cut it but For me it is more complicated as I have a FRV so it is this one for me..
http://www.ebay.co.uk/itm/330629682230?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_1576wt_656
Get it programmed from Honda for 36 ( thats best quote in...
Just summarising my understanding...
I have bought spare key with transponder from Ebay which I am supposed to take to Honda dealer to get it reprogrammed and afterwards get blank key cut from locksmith and Bob's my uncle!!!