With Andrew Davies as our indefatigable, knowledgeable and entertaining guide, this promises to be a fascinating day.  Beginning with the engineering marvel of the Victorian Market, this tour will include the old gate of 1504, Clerkenwell with its Georgian Library, the medieval church of Barts Hospital, Postman's Park, a little known gem with touching memorials, Charterhouse Square, a plague pit, Art Deco flats associated with Hercule Poirot, and all the nooks and crannies of 'Clerk's Well' and 'Smooth Field' (as the area was originally named) that Andrew is renowned for uncovering.  There will be independent time for lunch.