I am about to move house, and the hefty SDLT is bugging me a lot. I did a Googling and realised there's a loophole to 'reduce the UK tax payer's liability'. There are legal companies out there who undertake this. They typically charge between 25% to 50% of your saving on Stamp Duty, they prefer house prices over £500k but there are companies who work on £250k properties too. They claim that their approach is completely legal and legitimate, and HMRC is aware of such loophole. Has anyone had a go on any of these?