Elsie Clark in 'Evenwood's Hey Day' (available at the Bowes Musuem) cites a C. T. Clark in the RAMC enlisting in September or October 1915.
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Sources:
Last Name: www.newmp.org.uk; Initials: www.newmp.org.uk; Local Memorials: www.newmp.org.uk; Teesdale Townships: Teesdale Poor Law Union 1914; Notes: Evenwood's Hey Day' by Elsie Clark available at the Bowes Museum;