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Thanks very much for the prompt replies, I suspected the stopper was supposed to be in place. Fortunately the stoppers in both the drains are still attached by their chains and so did not block the bottom ports - it was about a foot of sludge blocking these until I cleaned them out.

The drains in my drive are a circular sump about 2.5ft deep. There is an outlet at the bottom of the sump connecting vertically to another half way up. By this higher outlet there is a stopper on a chain which fits this outlet. Is the stopper normally supposed to be in place?