Endangered (proposed as a future Red Data Book species) and thinly distributed in England, but sometimes numerous where it occurs. First added to the Hampshire list on the basis of AM Emmet's account in Ent Rec J Var 98: 134: "Recently S N A Jacobs gave me a box of unidentified Nepticulidae which included a few taken by the late W Fassnidge. Amongst (these) was a specimen of T. beirnei captured at Southampton on 20th August 1935. This seems to be the most recent British record..." Fassnidge's "Southampton" was a very vague term for the district, and not necessarily the actual city, so the location of capture is unknown for this and many other specimens in his collection. In Hampshire it has been found to be reasonably common at Stoke, and at Hayling Billy, on Hayling Island: also once to light in Southsea, close enough to perhaps represent a wandering individual from Hayling. The sole Isle of Wight record is of one determined from an adult captured at light in the north of the island in 2016. Wingspan 8-9 mm. The life history is still a mystery: according to Nieukerken et al. (2010), probable food plants lie in the genus Genista but mines and caterpillars are still unknown: Emmet (loc. cit.) states that the moth flies in grassy areas where G. tinctoria grows, which would corroborate.