Just to add to this forum a success;
Bought a 2008 Vellfire a few weeks back - only one key (4 button with lock/unlock, open side doors, also smart key in that doors unlock when you have it on you and touch the handle).
Followed Chris above in forums, bought a spare (checked code on chip to ensure the same as one I had), bought the cable which comes with software and installed on my very old Windows 10 laptop (person I bought off sent a disc for 64 bit installation).
All reasonably straight forward, new key programmed first time so now have 2 identical keys that work (just need to get blade cut now). All for £75, including software to hopefully alter some settings too.
Thanks to these forums. Anyone want advice just let me know.