Hi James and welcome to the forum. Without knowing the running number of the coach in which you travelled it is impossible to be specific about service dates.
From your photos I would say that it is a British Railways Mark 1 coach. These were built between 1951 and 1963 and some remained in regular service with British Rail well into the 1990's.
Some are still in mainline service with charter operators whilst others see use on heritage lines such as the Great Central.
Hope this helps.
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