Sherlock Holmes Society of London: First Court, Christ's College - the Chapel and the Master's Lodge (photo by Roger Johnson)
Sherlock Holmes Society of London: Jonathan McCafferty outlines the schedule for the morning (photo by Roger Johnson)
Sherlock Holmes Society of London: He tells us a little about the Holmesian sights of the city and the surrounding area (photo by Roger Johnson)
Sherlock Holmes Society of London: Peter Horrocks adds some corroborative detail (photo by Roger Johnson)
Sherlock Holmes Society of London: And so does Guy Marriott (photo by Roger Johnson)
Sherlock Holmes Society of London: Guy Marriott's group arrives at the Pepys Library, Magdalene College (Guy Marriott)
Sherlock Holmes Society of London: En route to Trinity Hall with Peter Horrocks' group - one of the quintessential sights of Cambridge: King's College Chapel (photo by Roger Johnson)
Sherlock Holmes Society of London: Our guide at Trinity Hall, Dr John Pollard, Fellow Archivist and Librarian, with Peter Horrocks (photo by Roger Johnson)
Sherlock Holmes Society of London: Front Court, Trinity Hall (photo by Roger Johnson)
Sherlock Holmes Society of London: The Dining Hall, Trinity Hall (photo by Roger Johnson)
Sherlock Holmes Society of London: In the Dining Hall - Dr Pollard, Trish McPherson and Catherine Cooke (photo by Roger Johnson)
Sherlock Holmes Society of London: The Old Library at Trinity Hall - above the Graham Storey Room (photo by Roger Johnson)
Sherlock Holmes Society of London: The Old Library and Latham Lawn (photo by Roger Johnson)
Sherlock Holmes Society of London: Chained books in the Old Library (photo by Roger Johnson)
Sherlock Holmes Society of London: Dr Pollard explains some of the unusual features of the Old Library (photo by Roger Johnson)
Sherlock Holmes Society of London: A rare treasure: Historia Monasterii S. Augustini Cantuariensis, by Thomas of Elmham, c. 1420 (photo by Roger Johnson)
Sherlock Holmes Society of London: This is the oldest purpose-built college library in Cambridge still serving its original function (photo by Roger Johnson)
Sherlock Holmes Society of London: Another treasure: Ptolemy's Atlas of the World, 1583 edition (photo by Roger Johnson)
Sherlock Holmes Society of London: Auberon Redfearn, alumnus of Trinity Hall, shares a memory of his college days with Kate Horrocks (photo by Roger Johnson)
Sherlock Holmes Society of London: Dr Pollard displays a recently discovered priceless rarity, a grant made by Mary I and her husband Philip of Spain, 1558 (photo by Roger Johnson)
Sherlock Holmes Society of London: Another precious item: Roger Dymok's Refutation of the Lollards, c. 1395 (photo by Roger Johnson)
Sherlock Holmes Society of London: In the capital O of Roger Dymok's treatise is a portrait of King Richard II (photo by Roger Johnson)
Sherlock Holmes Society of London: Something a little more recent - Table Talk of John Selden (photo by Roger Johnson)
Sherlock Holmes Society of London: The Latham Building, identified by Peter Horrocks (another Trinity Hall man) as the scene of 'The Three Students' (photo by Roger Johnson)
Sherlock Holmes Society of London: Latham Lawn stretches down to the River Cam (photo by Roger Johnson)
Sherlock Holmes Society of London: A group photo, minus the photographer (photo by Roger Johnson)
Sherlock Holmes Society of London: A group photo - minus the photographer, Kate Horrocks - in front of the Latham Building (photo courtesy of Roger Johnson)
Sherlock Holmes Society of London: First Court, Trinity Hall - a bit of the 14th century (photo by Roger Johnson)
Sherlock Holmes Society of London: Trinity Hall Chapel (photo by Roger Johnson)
Sherlock Holmes Society of London: Jonathan McCafferty introduces Professor John Hughes (photo by Roger Johnson)