Bang on and until the pound makes some ground on the yen nothing will change.Wouldn't hold your breath. It's the Yen/£ that has the biggest effect.
Kerso may be the better option
Don't hold your breath, and don't rely too much on Camera Price Buster either. Canon have cut back production, and retailers are holding less stock, so the chances of actually being able to buy lenses at the prices you see are distinctly iffy right now.