PaulBrislen: Wikipedia is my friend!

snip:

ACCOLC (Access Overload Control) is a British procedure for restricting mobile telephone usage in the event of emergencies. It is similar to the GTPS (Government Telephone Preference Scheme) for landlines.

This scheme allows the mobile telephone networks to restrict access in a specific area to registered numbers only and is normally invoked by the Police Incident Commander (although it can be invoked by the Cabinet Office). The emergency services are responsible for registering their key numbers in advance.
snip:

And in response, I've checked and we only prioritise 111 calls (they always have top priority). We are looking at the ACCOLC scheme from the UK but it's at an investigation stage at the moment.

How's that for responsiveness, Mauricio?

Cheers

Paul