The caveat being, if after all those years of sweating and scrimping to pay for the house, you happen to end up in a nursing home, then unless you can afford the £450 per week fee for your accomodation, the council will seek recompense and make claim to your property.
basically you will be left with nothing, any plans that the property might be left to your offspring or others being dashed to the ground in one fell swoop.
my advise is, start saving like mad for that future internment, you might then just beat the system.