Pay off full mortgage

rafhelp

Say you had a mortgage of £100,000 and you were paying it as normal.

Then you won £250,000 on a scratch card.

it would make sense to stop paying mortgage and just buy it all with a lump sum payment.

but is this possible?  If yes what is the name given to such a event, are their hefty fees etc...

Another question on similars line:

Say instead you won just £50,000 on the scratchcard and your house was £100,000 on shared ownership (75% ownded), is it possible to restructure and refinance so that you completely buy half the house using most of the winnings and then reduce from 75% to 50% ownership and pay rent on the non owned portion.