Iolanthe in London

We went down to London yesterday to see Iolanthe (a Gilbert and Sullivan play) at the Geilgud theatre. I have not seen any of their stuff before but it was pretty good. There were a lot of references to British politics that I did not quite understand but the production values seemed good and it was entertaining.
We took the train down and back and used a line which went into Liverpool Street Station that we had not tried before. Overall I liked the train a little better but it was slower than the line that goes into Kings Cross. It also required more travel on the underground to get to central London but it was slightly cheaper. We discovered that you still have to go up to the ticket window to get the cheapest tickets (as opposed to ordering them online or getting them at the machines). For four people it was 38 pounds total for a return trip into London (off-peak).