Easy stuff!
Now, this is only the first round since if the pounds are then not as scarce or the dollars made as available as the investors expect, then the foreign exchange movements could reverse themselves. All this ceteris-paribus which in Latin means all-things-kept-equal but that in normal slang means ignore-the-complications, and , of course, within comparable realities, as we all know there are places where money will always be utterly scarce without the investors being tempted to go there.
Now, in these circumstances, the only thing that is expected from an intelligent investor is to know where he finds himself; where the rest of the market is; what the gatekeepers the Fed and the Bank will be up to; and what other surprises, normally busts and other ugly affairs, could interfere with the way you infer things should be heading. Easy stuff!