Hi I have my Canada pension automatically going into my bank in Canada but after my house sells I’d like it to come to bank in U.K. Question when that happens do I file my taxes in U.K. or Canada then

Normally you file taxes to the country in which you are residing in so if living permanently in the UK then it would be the UK.

I’m retired I only get a pension from Canada nothing from UK

https://www.canada.ca/en/services/be...it-amount.html - how to get your pension paid in the UK
What taxes you have to pay in Canada (if any) https://www.canada.ca/en/services/be...ore-apply.html

This page may be of use to you too https://www.canada.ca/en/revenue-age...t-seniors.html

Be aware that you may have withholding taxes from the sale of your house.. read the 'leaving Canada' part of this wiki section for details https://britishexpats.com/wiki/Tax_a...e_Sales-Canada