<profile name="GB_national_to_e164" description="Convert from GB national dialling to E.164 format">
  <rule regex="^\+(\d+)$" replace="$1"/>
  <rule regex="^00(\d+)$" replace="$1"/>
  <rule regex="^0([1-9]\d+)$" replace="44$1"/>
  <rule regex="^(\d+)$" replace="$1"/>
</profile>