House prices in former chancellor George Osborne's neighbourhood of London have fallen almost 10pc in the last year, partly as a result of the fallout from his changes to stamp duty.
London estate agency Stirling Ackroyd said prices in Notting Hill fell on average 9.6pc in the last year, as a result of the high-end housing market slowing down, which was partly due to the increase in stamp duty in December 2014 for homes worth more than £970,000.
Mr Osborne's home in Notting Hill has fallen in value 2.7pc in the last year, according to Zoopla figures, and under the rules the stamp duty payable on his home is £373,470.
This comes as private housebuilder Avant Homes and the author of an influential report into housing, Sir Michael Lyons, argued that the Government should consider making stamp duty more flexible, set at different rates across each region of the UK.
This week, The Daily Telegraph has launched a campaign to urge Philip Hammond, the Chancellor, to address the issue of stamp duty at next week's Autumn Statement.
Rob Walker, head of real estate tax at PwC, said "current levels of property tax are greatly impacting the market", adding that "they have a ripple effect".
"The Chancellor could look to reverse some of the recent changes, if there's no longer a bubble to defuse, then the focus needs to be restoring market confidence. By emphasising property tax receipts have fallen across the board, he could show this isn't about helping the 'privileged few', but making sure ordinary people can move up or down, or even get on the ladder."
His comments came as government figures revealed yesterday that there was a 52pc fall in the number of affordable homes built in the last financial year, the lowest level in 24 years.
Avant's chief executive, Colin Lewis, said the Government should change its "one size fits all" mentality when it comes to stamp duty. He said: "The Government should look to regionalise their approach to stamp duty by looking at what the market is doing in each region, because there is not a homogenous housing market in the UK."
He added: "The duty [people] have to pay when they buy a house should be relative to the earnings they receive."
A report by Sir Michael Lyons, released this week, also agreed that the Government should consider reforms to stamp duty as part of the forthcoming White Paper on housing, which is due to be released with next week's Autumn Statement.
In an update to his influential Lyons Housing Commission, which was established in 2013 to advise the Government on increasing levels of house building, he said government should consider "allowing local authorities to set stamp duty rates for new-build properties and large build-to-rent developments".
He added that this would help improve affordability and increase the number of transactions in an area.