None at all.
Just out of interest...how have those with no mortgage managed to get in that position?
Inheritance?
Low house costs?
Mega ££ pay which allows ridiculous overpayments?

A million times this. A small, controllable debt is often a good thing.
Just out of interest...how have those with no mortgage managed to get in that position?
Inheritance?
Low house costs?
Mega ££ pay which allows ridiculous overpayments?