Until September 2016 Ofcom would issue lists of unallocated amateur radio call signs to help people select a new call, this has now changed.

In December 2016, UK Amateur Radio Operator  Mike Lewis wrote to Ofcom asking for a list of available callsigns.

List of available callsigns - https://www.ofcom.org.uk/__data/assets/pdf_file/0014/90221/Request-for-Information.pdf