I did some calculations for the Labour Land Campaign a couple of years ago showing that if we replaced all existing taxes related to housing, private wealth etc with a fiscally neutral Land Value Tax, it would work out at about 0.7% of what each house is worth.
Unsurprisingly, if you can be bothered to look at actual numbers, most people's lifetime bills would not change much; it's just that taxes imposed at random intervals (SDLT, CGT, IHT) would be replaced with a small additional annual amount, it's all swings and roundabouts.
Tory head office got hold of the workings somehow, with entirely predictable results.
Squeal, piggies, squeal.