Are you sure that the Borough names are part of the UK map provided by JMP?
If you have different Names (Boroughs/regions) you have to install the appropriate map first.
"Camden" should show up but "Camden and City of London" not
Did you check the map file in the installation directory?
![mlo1_1-1678114665850.png mlo1_1-1678114665850.png](https://community.jmp.com/t5/image/serverpage/image-id/50749i6288FDF6CFF15929/image-size/medium?v=v2&px=400)