It sounds like you're well qualified. However, in the UK a PhD takes a long time, there are usually no credits (unless you're doing a Professional Doctorate like a DBA or similar). you will have to produce a dissertation, between 80-100,000 words in social sciences, in sciences usually 40,000 words.
Full-time: minimum duration three years
Part-time: minimum duration 4/5 years, maximum 60 years