I'd say the better way to look at it is that the gbp was in a leading mid to long term profit taking phase against the usd, and it was out of sync with the euro which lagged.
In other words, until the world gets the heebie jeebies about the US deficit (hasn't happened yet), I expect further weakness in EUR and GBP, and possibly CHF, and any strength is profit taking phases.
Also, I recommend doing what I'm doing which is switching short term to JPY crosses instead of USD. It seems that Japan has far less it can actually do.
That said, I know Japan has done an intervention as recently as the 90's to the tune of ten damn yen against the USD in the course of an hour during lunch hour.
Fact is, the JPY and the USD are quite similar, as they tend to do the same thing in all pairs, unlike how the EUR will gain against the USD but drop against the JPY while USD/JPY will flounder. blah blah blah