Yes, you can use Jungle Scout and Helium 10 in the UK and Canada! In fact, you can access both of these tools wherever you are. Another important aspect is if these tools provide accurate data from these regions and can filter between https://www.amazon.co.uk and https://www.amazon.com marketplaces. This is where it gets tricky because Jungle Scout and Helium 10 have so many features that some tools might not get the data for your country but luckily the biggest regions like the USA, UK, Canada, etc. are covered and you will be able to find product and keyword data for your region using both of these tools.