Hi Tricia,
I've been on 8 singles holidays since 2010 and have my 9th booked for October this year.
My advice would be to perhaps consider looking at this from a different perspective; so rather than thinking about a short holiday in UK, ask yourself is there anywhere in the world that you have always wanted to visit? If the answer to that question is YES then my advice would be to go for it!
For me, I had always wanted to go on a Nile cruise. The choice was easy because, being interested in history, I had always wanted to see the sights that I had read about and (up to then) only seen as pictures in a book. I look back on that first holiday now with very happy memories. So if there is somewhere in the world that has always had a calling for you, take the opportunity and book it.
I know that it's a little daunting but it's exciting too and, having taken the plunge, I'm sure you won't look back.
All the best whatever you decide.
Mike