How to get permission from mortgage lender to rent out my flat?

Hi there;
We bought a flat nearly three years ago with my husband;
Now we want to buy a house, move out and rent out the property;
We can also remortgage soon.
What is the best option for us?Shall we just ask for persmission our current mortgage lender or search for new mortgage provider?
We may move my sister back to the flat in a year so I don’t really want buy to rent mortage;

Thank you very much for suggesting the best options!

Alex

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