You should determine your residence for tax purposes. This is decided by CRA, it’s not an arbitrary decision made by the taxpayer.
If you work and live in the UK it may be you are considered non/resident in Canada. Or the other way round. Either way you should be able to input foreign pension as exempt under treaty on your Turbotax file. I’ve never had to do that, but it is sn option on the foreign income page. Contact Intuit help if it’s not obvious.
( It is an option because some CRA filers eg from India will report exempt pension income as their treaty with Canada works differently from the UK Canada deal).
