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 348668) with original publication details: Acta Mus. Morav., Sci. Biol. 90: 256 2005.
This name was in version 1 of The Plant List, record kew-348668.