Well it seems to have worked!!!
After the router rebooted it came up again showing N.America as the region but this time the otther countries could be accessed and so I selected Europe and updated it. I notice the NA has now gone from the end of the firmware version too so that makes sense.
Where it says Mode, it's currently showing up to 72mbps, but there is also an option to select up to 150mbs. Do I leave as is or select the faster option. Not really sure what these settings are referring to tbh.
Thanks so much for all your help and patience.