Probably already been mentioned but in England, if the circumstances are right, you can get £1m tax free inheritance.
E.g, parents own a £1m house.
Parent 1 dies - £325k universal allowance passed onto spouse, plus £175k main residence nil rate band
Parent 2 dies - total allowance £325k x 2 = £650k plus 2 x main residence allowance (£175k x 2 = £350k)
= £1 million, tax free.