In recent times Wessex Log Sheets have appeared on ebay.
Salvaged from former Wessex Studios and sold via. Sotheby's 2 years ago as a job lot.
Truth :- They are actually not signed by Brian nor John but the sound engineers who would often had competitions who could sign their signatures the best which the guy's found funny. Mike Stone was very good indeed at signing for Brian.
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So you were there when all this happened?