Have Just You ever considered doing long weekend in the UK?, not just the Discovery Weekends.
I have just returned from a very nice "singles weekend" trip with another company. We went to Cadbury World and Warwick Castle.
Maybe this is something Just You could look into for next year.
Another place that would be of interest I'm sure would be where they film Downton Abbey. There are so many interesting places in the UK that I'm sure us single people would like to visit.