Previous answer
Hint: A boat narrowly escaped getting stuck in a bridge hole! Can you guess which canal it happened on?
Answer: This photograph was of narrow boat Collingwood stuck in an old bridgehole at Lowsonford on the Stratford-upon-Avon Canal. The photo was taken By Bill Greenhalgh on 18th August 1974.
Correctly guessed by: Jerry Bolter, Ivan Cane, Tony Clayton, Martin Hunt and Marion Pearse.