THIS  beautifully ornate certificate was received in Okehampton in October 1920 from the War Office. It was sent as a public thank you for the providing of a temporary hospital in the town for the sick and wounded. It is accompanied by a certificate signed no less than by Winston Churchill, who would later go on to become Britain's Prime minister in the Second World War. It was sent in to the Times by Okehampton historians Mike and Hilary Wreford.    As Mike explains: 'The location of the building in question is unknown, as there was no hospital as such in Okehampton at the time, as the War Memorial Hospital was not opened until the October 20, 1926, when the ceremony was performed by the Mayoress of Okehampton Mrs G K Blatchford and filled the pressing need at the time.   'What is known, however, is that many large houses and estates were commandeered  by the War Office for use as temporary  hospitals and convalescent homes during the war years with the large number of causalities. 'It would be most interesting if any Times readers could throw light on the mystery of this building which obviously contributed to the war effort.' Mike may be contacted at [email protected]">[email protected]