This name is a synonym of Thymus praecox subsp. britannicus (Ronniger) Holub.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 205457) with original publication details: Quatre Fl. France 841 1938.
This name was in version 1 of The Plant List, record kew-205457.