I would like to see a close up of the flower before firmly identifying this as Bugle. The key difference between Bugle (Ajuga) and Salvia or Stachys is the flower shape. Salvia has both upper and lower lips well developed, the same applies to Stachys . Ajuga has a well developed lower lip and poorly developed upper lip, as in Diddly's photo, where you have an obvious 4-lobed lower lip and virtually nothing for the upper lip.
I'd strongly dispute Diddly's comment that the leaves are wrong because they're too smooth. Ajuga reptans is easy to recognise in the wild because of its shiny leaves with more or less smooth edges. it grows in dampish places and is quite tolerant of shade. There's various varieties with darker leaves which is widely sold.
There are other species of Ajuga, for example Ajuga pyramidalis, A. genevensis. So I would presume Diddly's, which from flower shape does seem to be and Ajuga, but whose leaves are wrong for Ajuga reptans, is either a different species of Ajuga or a hybrid. see here for a garden form of Ajuga reptans clearly showing shiny leaves with non-serrated edges.
I accept Diddly's comment that the leaves look too narrow, and that's one reason I'd like to see a close-up of the flower before coming down on the "Bugle" side. Flower shape is very important in the higher level classification of plants (family and genus) - flowers are the means of sexual reproduction, and therefore the means by which genes are inherited and new species evolve, so any classification which seeks to replicate the evolutionary tree places great emphasis on flower shape ... except, of course, now we have the ability to actually look at the genetic material we don't have to rely on physical characteristics so much. It's because we're looking into the DNA and discovering relationships and differences that are difficult to distinguish purely from physical characters that we're having to revise some of our plant names so that the scientific names continue to reflect the evolutionary tree as we now understand it to be.