Well Neil....used the top of a teaspoon on the 'time' icon and voila!...secret menu.
Checked the card and noticed checksum fail. Followed your link and downloaded the formatting tool and formatted the card.
then created new folder "Garmin" (capital G ) ...renamed the file from gmapprom to gmapsupp...held my breath and replaced the card back into my vintage nuvi 610...turned it back on...another pregnant pause...went to maps...NOW HAVE 2 MAPS SHOWING!!
I restarted the unit and went through the time option and now the checksum is there!!
Can only assume that the mapping will now work when we get off the plane and we won't spend 4 days looking for our hotel!!
I can't thank you guys enough for your patience and help...I'm a firm believer in 'what goes round, comes round...' in which case you lads deserve a good turn from somewhere for your kindness...THANKYOU