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Hi there. Oh, worry not - I don't intend to give on this mystery any time soon! - the problem will be time, as obviously I can only look into this at weekends - and only occasional ones at that. Here are a couple of bang up to date images - make sure you read my accompanying updated notes too: 1. I've temporarily moved the bird bath + square (small) paving slab we've had on top (as neither were attached). 2. Unfortunately ZERO sign of any markings underneath - i.e. NO indication of a plaque / notice having been removed etc. 3. Ignore the smaller square "border" - that's simply where the small paving slab was - i.e. debris etc. from around the edges. 4. Likewise, ignore the apparent sign of metal in the middle area. This is also just debris (twigs etc.). 5. This doesn't give a true impression of the raised nature of the rectangular central area. It's a fair few inches. 6. NO sign of any other potential entrances / exits (sadly!) John.