Porting

Porting is an option available to most, but not all mortgages. It allows you to move home without paying your early repayment charges.

The best way to describe it is like this. Imagine your mortgage and all its terms & conditions, including early repayment charges are in a cardboard box. That box is placed on your home. If you decide you want to move home you take the box with you.

As long as you keep your borrowing at the same or increased level you will avoid penalty.