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 204532) with original publication details: Repert. Spec. Nov. Regni Veg. 20: 330 1924.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:460972-1.
This name was in version 1 of The Plant List, record kew-204532.