Superdrug has a Female Testosterone Service. They sell Testogel but it is very overpriced. Can't say how good their advice will be and how carefully a patient's testosterone levels would be monitored.
Given the price they are selling Testogel for - 3 sachets for £18 - and a testing kit for £50 that only gives total testosterone, not FAI, I would say it is not value for money. Better to try GP or, failing that, a private menopause specialist.
But at least they are recognising a need/demand!