How do I report cash hel in UK bank account from 2008 transferred to Canada 2015

[poolside]

I have held over the equivalent of over C$100,000 in a bank account in the UK since we moved to Canada in 2008 waiting for sterling to go up. I have always reported income and completed the T1135 form. However I have now converted this to C$ and transferred into my Canadian bank account. At the time of leaving Canada the conversion rate was around 1.85 and I converted at 2.04. Do I need to report this as a capital gain and if so how to I put this on my Tax Return. Tried researching this question but cannot find the answer anywhere. Really appreicate any advice.