Chater-Lea tandem bicycle that Dr. Slade ordered for Susannah Peppermore - before he got cold feet. Here's another OldBike ad showing the Chater-Lea.
I have my own a small collection of old English bicylces. I have had a couple brought back to life and have endowed my daughter with two of those. When my son gets bigger, I have a Gent's Humber from the 1950s for him. (Whether he wants it or not - see below). I have a couple of others that I love to hang from the rafters of the house I imagine I will build someday. They are art as far as I am concerned.