Suppose Russia retaliates militarily against Turkey for the latter's criminal downing of a Russian bomber jet. NATO would likely invoke its collective defence agreement here and other members of the gang would come to rescue Turkey by waging a war with Russia. This doesn't seem logical or even legal.
Britain claiming that an attack by Russia on Turkey is the same as an attack by Russia on Britain, this seems too foolish and provocative. It's like this has been designed to cause large-scale wars, as if some of the NATO members want war, rather than letting bilateral conflicts remain bilateral.