Payment of your mortgage debt seems sensible idea within certain conditions:
(1) Your mortgage is repayment only.
(2) You retain enough savings to maintain the house owner's financial responsibilities to maintain the house in suitable living order. For example what happens if you need a new central heating boiler etc? You should similarly have enough saved to cover services (gas, electric, telephone etc.). Similarly your building, house-contents insurances.
Then there is your car insurance, servicing etc., if you own one or more.
All adding up to thousands a year.
(3) In the latter half of the 1990's I paid off over £40,000 of our 53,000 mortgage without a penny of charges being levied.
(4) Think and talk to all involved. If OK I think you should retain about £20,000 for now. And can you go to interest-only?
Don't act precipately. Cannot believe that paying off a massive debt (mortgage) would be deliberately disposing of your capital, but check.
Keep in touch,
SIQ.