This grower is fairly sure of this plant identification.
I have two types of thyme - when one is growing well the other is not and vice versa.
Wild thyme, Breckland thyme, Thyme, Creeping red thyme
Thymus serpyllum (Wild thyme). This species will grow about 25cm and will spread of 45cm, forming useful ground cover. It has creeping stems which are woody and branching. The leaves are scented, bright green and elliptical to lanceolate. The bluish purple flowers are small and tubular with 2 lips, and are borne in spring and summer in dense terminal whorls.
They are fully to marginally frost hardy. You should plant them out from early autumn through to early spring in a sunny site with moist, well-drained soil.
Walls, rock garden, ground cover, culinary, medicinal. Summer interest.