Tonight(Tuesday, November 1st) on BBC 2 there is a documentary on BBC 2 on the ''Cockleshell Heroes'' .The Royal Marine Commandoes attack by kayak on merchant shipping in the French port of Bordeaux. They placed limpet mines on the hulls of the docked ships in what today, looks like a suicide mission. The programme goes out in England, Wales and, I presume, Northern Ireland, at 9pm. Although we in Scotland will have to wait until 11-20pm tonight to see it. It will be interesting to those like myself, who are old enough to recall watching the film ''COCKLESHELL HEROES'' in 1956 on its first U.K. cinema release. This movie starred Trevor Howard and American Jose Ferrer and Tony Newley before he became a big 1960's singing star and married ''DYNASTY'S'' JOAN COLLINS AKA ''ALEXIS COLBY''. The majority of those R.M. Commandos caught post-raid were shot summarily under Hitler's ''Commando Raiders' edict although some escaped to Spain. The blurb in one British newspaper for this programme quotes Churchill as saying that the raid shortened the war by six months but -no disrespects to the gallant participating Marine Commandos-but I doubt disabling/sinking a handful of Axis merchasnt ships in Bordeaux harbour would have achieved that?.