It was the Civil Service social club, I think it was part of the deal that brought the staff of the old AGD here in the late 60's but it was available to any civil servants to be members. At its height the main building was a bar/restaurant and there were facilities for snooker and table tennis in there. The smaller Saddlers bar was a function room for parties etc that could be hired by non members. Outside they had football cricket and bowls.
As for its closure I'd hazard a guess at least of 10 years