Strangely, the Beeb posted this informative fact check a while ago.
https://www.bbc.co.uk/news/articles/c8rlk0d2vk2o
"Under the new rules, those 462 farms would be affected by the 20% inheritance tax on any value above £1m (not on the whole value).
However, as Mr Neidle points out, like for the rest of the population, there is no inheritance tax to be paid on the value of property up to £325,000, bringing the untaxed total to £1.325m.
If a farmer is married, his or her spouse would be able to pass on another £1.325m tax free, taking the total untaxed amount to £2.65m*