Some (many?/most?) mortgages can be moved to another property within the fixed period, so unless you're moving to another country or getting out of ownership completely you still have some freedom to move.
Of course they do - but they charge you a hefty whack for the privilege
Unless you mean porting - it’s a ball ache though and they have you by the balls.
Too many balls
@Howard started
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Some (many?/most?) mortgages can be moved to another property within the fixed period, so unless you're moving to another country or getting out of ownership completely you still have some freedom to move.