Interesting book on How To Read Spark Plugs

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Just bought a book advertised in classic car mag called Spark Plugging The Classics by Stan Dibben,a fascinating insight on the correct way to read spark plugs,just  16 pages but worth every penny of the £4.00 including post and packing ISBN 978-0-9556595-3-9.Published in Britain.Thaught it might be of interest to some petrol heads   Cheers.Mike.