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Post by dave1 on Jun 14, 2018 15:22:52 GMT
Recently I was told that a number of staff over the years have had to sign the OSA although it was mostly telephone staff, that's all I know at the moment can anyone else add more.
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Post by Nortube on Jun 17, 2018 13:52:37 GMT
Train staff never had to, but I suppose it's possible that some staff who would have access to sensitive areas may have had to.
"Shhh, this tunnel is a secret and you mustn't tell anyone about it!"
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