Sir - Andrew Ffrench (Weekend, March 16) throws down a challenge when he writes that every Oxford reference in Blenheim Orchard is spot on.

I noticed two errors. Farndon Road is said to divide Hayfield from Bainton Roads (page 30) and the Carlyles' house in Bainton Road, whose location is carefully described (page 196), is said to have a cellar. If it does we haven't found it after living in the house for 25 years.

Michael Harrison, Oxford