Last time I went was my last review of the place (end of January) when I saw Emma. I was led into the room by Laura and she asked for payment. I think it was around that time the new pricing structure was just coming in. So she asked for £40 for 30 mins, and when I gave her 2 £20 notes she said she would just go and fetch my £10 change and if I could give that to Emma for the HE afterwards. So I don't know if shed misunderstood?
But yes it looks like the wank whilst having 30 mins is a £10, whereas the wank when booking 1 hour is £20. Strange.