Forms of Sea Attack on the United Kingdom. Report by J.I.C.

So far as shipping concentrations are concerned, the two ports of Southend and Spithead, used for the collection of coastal convoys would be considered inaccessible. Elsewhere, on this part of the coast, there is unlikely to be any concentrations. of shipping sufficiently constant or sufficiently large to warrant the abandonment of Germany's anti-raid policy, unless as part of preparations for an invasion of Europe by ourselves. This is the only circumstance in which we can envisage a German raid.