I am booked on the New Year's Cruise you are thinking about. This is my first cruise, let alone singles cruise, so I can't tell you much about how they compare. I do think it will be a really fun cruise, the ship sounds like it has lots to do. I have spoken with Dixie at Vacations to Go, she told me about a month ago that the age range for the group was mid 20's to 60's. I'm in my uppper 30's American living in Germany, flying to Florida for a cruise!?! Like I said, it looks like fun.
Sorry I can't answer any more of your questions. But I'd love to hear if you find any singles cruise out of England.