I started using the app this morning and it looks great.
I started to download the UK map data and carried on checking the app out. This crashed the app. I went back in to check on the progress of the map download and it was not downloading. I checked the list of available maps to start the download again and the UK map had disappeared from the list.
16 days ago
That would indicate that the map has downloaded. The UK map is missing from my list as it is already on my phone.