Again the reason you wont see any information detailing the Validation of the UK Part FCL license at the moment, is the UK Part FCL license is an ICAO license.
Most EASA NAAs already have a process for which a 12 month validation of a third country ICAO license can be obtained where an operator sees a need to employ a non EASA licensed pilot. Therefore the UK FCL licences is covered by the existing agreements for ICAO licenses in EASA.
So while this is not quite the same as mutual recognition; it is again incorrect to say that EASA does not recognise the UK FCL licesnse.
The EASA 12 month validation process for ICAO licenses covers UK FCL licences.