Thank you everyone for your replies to my previous post. I decided at the very last minute to go to the show. I wore latex gloves and asked the box office staff if there were any seats available in the balcony, explaining that I was in chemo. The manager came and thanked me for coming despite my low immunity and offered us brilliant seats in the balcony which had been returned. There were only 6 of us in the curtained off section and no one coughed or sneezed.
The show was brilliant and I haven't laughed so much in ages. I'm so glad that I went. It really cheered me up after my awful week last week.
Thank you lovely ladies for your advice.
Sian