23 May 2016 our circular tour started from London Marylebone via South Ruislip, High Wycombe and Princes Risborough, switching to the single track that leads up to Aylesbury. Lunch was taken at the Rockwood Arms and after a little exploration of the town centre, we returned via Amersham and Harrow on the Hill to Marylebone. The Train Operating Company used was Chiltern Railways and our transport was class 165 Turbostars.