On 21st July a fix to the postcode map display was made live.
Beacon can display a map locating a postcode from an address for members plus Group and Open Meeting venues. For example this link locates the Trust's National Office in London.
Beacon launches streetmap.co.uk to do this, but streetmap changed the syntax of the link url and this broke the way Beacon used the service.
Note that streetmap do not support Northern Ireland postcodes.