I'm not sure how much they would be prepared to dig up with little evidence.
Apparently new information has come to like and they digging beneath the concrete foundations of a garage.
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They've searched the area before and are now searching a different area behind the house. I presume there was no actual evidence the patio has been disturbed.
Explained here:
https://www.bbc.co.uk/news/uk-england-46027522