It is very telling for me that you say; I’d like to start a couple therapy, and not we would like.
I am a retired psychotherapist. Sorry for being picky.
you can try here for a therapist. search for therapists that specialise in couples therapy:
https://www.psychotherapy.org.uk/find-a-therapist/?Distance=10
https://www.counselling-directory.org.uk/
This is the best one for sure. But I would say that.
The Metanoia Institute.
https://metanoiatherapy.com/metanoiatherapists
Do avoid any online therapy.
People are more than a face on a screen. How do online therapists see involuntary body movements and body responses during the therapeutic session. They dont!