Scam - Hammersmith Police Station
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I checked on Google and sure enough this was a scam and the next instruction would have been to enter my full bank details and access pin etc.etc. so they could verify the crime.
We occasionally get the "We are going disconnect your BT account". type of scam which is easy to recognise, but this was particularly cunning and made us wary that next time we might not recognise the scam.