I sent my details for registration of my recently purchased Fast Find 220 PLB too.
Not ideal but I got the following email;
Your application to register or amend details of your 406 MHz beacon has been received by the Beacon Registry and it will be actioned as soon as possible.
Due to unprecedented demand for registration we might take up to ten weeks or longer to register your beacon.
I would like to assure you that even if an emergency beacon is not registered it will still transmit an alert, if activated, to the Search & Rescue authorities and action will be taken.
Regards, Beacon Team
UK Distress & Security Beacon Registry
T: 01326 211569 – our number is changing to 020 3817 2006
F: 01326 319264