Until September 2016 Ofcom would issue lists of unallocated amateur radio call signs to help people select a new call – they have now stopped doing this
On December 9, 2016 Mike Lewis wrote to Ofcom asking for a list of available call signs, on December 20 he received a reply from Julia Snape which said:
We do not hold a list of call signs that are available. Due to a system change, the assignment of call signs is now done using an algorithm rather than “grabbing” from a list.
Read more: http://bit.ly/2iGcVIE