Here are the UK Diploma or Post Graduate Diploma Relationship Trainings I know of:
Relationship Counselling Diploma Training Centres
Creative Couple Work - Trainings in North London. NIck Duffell and Helena Løvandal-Duffell provide an excellent relationship counselling training.
Re-Vision - Training in Maida Vale. Certificate and Diploma Course based on transpersonal psychosynthesis approach.
International Centre of Excellence in Emotionally Focused Therapy ICEEFT.com. USA Trainers provide EFT training UK and Europe.Training consists of 12 days of training. A 4 day Externship which on completion means you can list on ICEEFT Therapist listings for fee. Core Skills Training 1&2 and Core Skills Training 3&4.Courses get booked up. EFT is becoming a popular approach due to the public reading books 'Love Sense', 'Hold Me Tight' and EFT popularity in US and Europe. As trainings go, it's strength is a a fanstastic model based on loving attachment.Tthe training takes you through step by step in a rigorous way how the approach works.
CCPE - Centre For Counselling and Psychotherapy Education. Training Centre in Maida Vale . London. Transpersonal Couple and Relationship Therapy.During the course suggestions are given where you can find a clinical placement to fufil client hours requirement.
Tavistock Centre For Couple Relationships. London. TCCR Centres in Warren St and New St near Liverpool St Station. 3 year part time training.Clincial Work is done in house.
Marriagecare - You volunteer at a centre. You pay £800 towards EFT training/Travel/accomodation. They train you in exchange for 3 years 2 hours a week commitment.
London Diploma in Psychosexual and Relationship Therapy. joint course with the Naos Institute 18 days in year 1, 14 days in year 2. During the course suggestions are given where you can find a clinical placement to fufil client hours requirement.
If you know of any more that you would like to be included in this list please let me know.