Thanks Greyfox. Can't find anything else that fits. Sib is obvious enough and BS for books but that doesn't explain it. Is there a Walter Sibbs I've never heard of?
Ah! Light dawns. Thanks to Pentalpha & Greyfox. No I haven't because someone has promised me a copy!!! So I shall soon have a brain the size of a planet instead of a pea. (I don't normally approve of the overuse of exclamation marks but as this is the hallowed Chambers, thought I'd make an exception)