Owen, thanks for that. I've got it going with a metal din plug and just trying to organise to pick up the old units from gonfishing, if they don't fit I'll try these.
BTW your Ezymark came in very handy when my mate had trouble transferring data from the old unit to the new one he bought, what he didn't realise was that by going from an Elite to a Hook series he was actually going back in software.