Ah... thanks. I have my Garmin now anyway and I'm (slowly) downloading the Birdseye data.
I visited http://www.gpsfiledepot.com/maps/view/226/ which for the maps I need, led me to here:
http://www.smc.org.uk/ContourMaps.php
And this provides me with a load of '.img' files.
I can't, however, work out how to get these into a format that the Garmin will like? This is complicated by me not having a PC - Mac OSX only, I'm afraid. Is this possible on a Mac? Any pointers?
Thanks,
Jamie.