A little update.
Went to a different garage and had a long chat with the parts manger.
He knew of the kits for the focus etc but not what was required for the galaxy, and hunting through the parts catalogue drew a blank. He ended up emailing Ford technical service and the upshot is there is no kit for the galaxy, the only parts that are required are the switch (1381035) and the hazard switch/warning light assembly (1706147).
It is covered under a TSB from 2006 which has the cutting template for the glovebox etc, though there is an area moulded on mine that looks about right for cutting out for the switch position.
It requires 1.5 hours workshop time cutting/fitting/programming.
Quoted cost is £75 for parts, and with a total of £200, so a little more than I was hoping but not too unreasonable considering what needs doing.
Parts are on order for mine and it will be booked in as soon as they are in.
Hope this is of help to someone in future.