Like many others The Standard has fallen into the trap of thinking that the Mansion Tax is 1% on the value of any home over £2m. IT IS NOT.
If you read their manifesto you will see that it is a charge of 1% on any amount OVER £2m. So, someone owning a house of £2m won't pay £20k pa - they will pay NOTHING.
The story here is that the Lib Dems therefore won't earn anywhere close to the £1.7bn that they claimed the tax would raise.