Perhaps a visit to one of the swingers clubs in the NW?
When my other half had the itch, we tried clubs, fab all that kinda stuff.
Clubs - it’s hard to explain to a couple that my wife wants your wife, she doesn’t want you to touch her, but feel free to watch and touch your own wife. We got a lot of resistance.
Fab swingers - it’s such a ball ache, with the bullshit conversations. I enjoyed my wife understanding what guys go through when we are trying to get into someone’s knickers and that person asks questions like “do you like pets?” and we struggle to find the answer that unlocks those legs.
Internet dating - to many divorced women looking for ‘Lurve’ with another woman to prove she is still, young, vibrant or relevant. Even harder work to get into knickers.
In the end we went with escorts, my missus wanted to fuck not date other women (at the time) and after a slow start found her stride. Her favourite by a country mile was Chelseabrook, with a close second to a Tori ‘something’ (blond pixie haircut) whom was fairly well known in the northeast.
I would strongly suggest a good well reviewed escort, with a track record with girls or couples (not just her AW profile states bi) but expect the first couple to be nervy encounters, for your missus.