By Amber Murray Fears over potential changes to tax policy in Labour’s upcoming budget have continued to dampen the positive effects of lower interest rates on demand for prime property in London, according to new data. Buyers are nervously awaiting potential tax changes in the Government’s first budget, which has been described as assigning a “heavier burden” to “the broadest shoulders.” The latest prime sales index from Savills has revealed that values for prime properties in prime central London fell by 0.7 per cent, “given concerns around changes in the tax environment and general market u…