This forex pair represents the British Pound - Canadian Dollar cross. This Sterling ('base currency') is one of the heaviest traded pairs in the world. The Loonie ('counter currency') is typically considered a commodity currency due to Canada's reliance on energy exports for growth.
We have already held our breath through three rate decisions this week - RBA, BoJ and Fed - and all three left the market unfazed. However, we shouldn't grow complacent for the upcoming BoE.