What a great afternoon I had; wonder after wonder. For all that I knew intellectually that it was a final year production at the Royal Central School of Speech and Drama, I think that subconsciously I was expecting something like a school or church hall. This naivety stood me in good stead. They have their own theatre, the Embassy (here is its Wikipedia page), formally a professional, commercial operation but owned by Central since 1956. The set and the costumes were beautifully crafted, there was a cafe bar when we could get a drink in the interval etc. etc. In retrospect I shouldn't have been surprised, but I was and it added to my enjoyment.
Oh, and Mia was very good as Elizabeth. It was also good to see two of her classmates that I have met socially with her, Alex and Saskia, in it as well.