If it was me, and I am not an expert, I would leave NOTHING to chance (or VO discretion). The following previous post illustrates a sensible approach. Your choice.
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Re: Proof of funds Currency exchange rate
« Reply #4 on: July 28, 2016, 03:01:38 pm »
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I included a screen print of The Bank of Canadas currency exchange rate on the day of submission in our LOE, their currency exchange is accepted by the Canadian revenue association so I figured it would be the most acceptable for CIC as it is accurate rates and not mid market rates as a lot of currency exchanges seem to show.
Sadly, the UK pound crashed even further after the EU referendum and I panicked and put our proof of funds into a Canadian dollar account, raised a CSE and submitted new documentation to CIC to show what we had done.