I'm somewhat late posting details of this trade as it was entered by an electronic limit order at a time where I had no internet connection to tweet it live, although details of the trade possibility were posted on the ADVFN forum in advance.
In short, here is what attracted me to this trade, entered at 1.4260:
GBP:CAD has traded a choppy range for over a year now bouncing between 1.5300 and 1.6400 giving regular bursts of up to 1000 point thrusts throughout this time.
We now have a situation where it's back at the top of the range so we need to get clues on what the next move is. Historically you can see from the chart that the extensions to the limits of the range were not quite as powerful as this current move, furthermore, it can take days or even weeks to finally roll over at the limits of the range. So we could be slightly premature in hoping for a trade as early as this week, but it's certainly one to be aware of.