"Aircraft of the Royal Air Force, 1939-1945- Handley Page Hp.52 Hampden and Hereford." Three Hampden Mark Is (L4201 ‘GL-T’ nearest) of No. 14 Operational Training Unit based at Cottesmore, Rutland, flying in echelon formation over the countryside. These aircraft still carry the unit code letters ('GL') of No. 185 Squadron RAF which disbanded and merged with 14 OTU on 8 April 1940.