I'm afraid the Government have cracked down on all SDLT avoidance schemes, which previously entailed the property either being purchased in the name of a Company, or one whereby you grant a third party a right to purchase the property at a reduced sum to the sum you are buying for. Either way, there was a Judicial Review on all such schemes and the Government won.
So, I would suggest that you stay well clear of any Companies who do boast that they can save you money on Stamp Duty- it won't work!!
I hope this assists and answers your question.