A few words about the business you are about to come into contact with. The business is prostitution. There are various levels of this, but this fundamental fact should never be forgotten; what she is doing with you is for money, not because she has any feelings for you. “You’re not paying a prostitute to have sex with you; you’re paying her to go away afterwards.” - Courtesy of Lara Brooks.
Prostitution in the UK is LEGAL. You are doing nothing wrong when you pay a lady for sex, and neither is she.