When to Apply
Canada allows a high number of applications for this program from each of the above countries, and interestingly, United Kingdom already has 2,610 spots used out of their 5,000 spots for the year of 2017 (and it is only January). Hence, if you are from the United Kingdom and willing to migrate to Canada in the year 2017 you should get your application in now.
How to Be a Candidate
The first step for obtaining a Working Holiday Visa is to apply. If you meet the requirements, you will get a reference code which you will need to put into your MyCIC account to create your account.
Then you build your IEC profile and submit it. When submitting your IEC profile, you will enter into pools that you want to be in for Canada immigration. Then you wait for your invitation to apply (ITA). Once you get an invitation, you will have 10 days to request a work permit or decline the ITA.