Got home and connected to PC. Nothing doing.
Gave up and clicked on Andorra as my home country. Then all as usual except showing Andorran map.
Eventually managed to get new device linked to my existing MyTomTom account.
Downloaded UK&ROI map update, choose Reset to Factory Settings, then asked to choose between Iberian maps and UK&ROI.
Chose UK&ROI and all looking good until told I had chosen a recorded human voice which cannot read street names. Tried to switch voices but only one voice says that it speaks street names and that's Monica, who speaks - you guessed it - Spanish.
=> Further evidence that I've been sent a unit configured/destined for Spain. Will go back to Support and suspect another RMA is on the card. Might have wee play with Factory Tools ...
To put the icing on the cake, just received this from TomTom, "Dear Customer, We arranged a repair for you 10 days ago, however it looks like we have not yet received your item, so we just wanted to check up on the situation."