Visitors travelling to Canada by air are now expected to get an electronic travel authorisation (eTA) to enter Canada. However, the Canadian authorities have stated that until 29 September 2016, travellers who don’t have an eTA can still board their flight, as long as they have appropriate travel documents (such as a valid passport). For more information about the eTA system, and to apply online, visit the official Canadian government website. See Entry requirements
From 30 September 2016, if you’re visiting Canada you’ll need an eTA to board your flight unless you’re otherwise exempted (for example, if you have a valid Canadian visa or a permanent resident card). If you have British-Canadian dual nationality you won’t be able to apply for an eTA and you’ll need to present a valid Canadian passport to board your flight to Canada.
There is a general threat from terrorism. See Terrorism
Around 724,000 British nationals visit Canada each year. Most visits are trouble free.
Take out comprehensive travel and medical insurance before you travel.