Several high street banks have cut their mortgage rates after weeks of rising costs due to the Iran war . HSBC is set to introduce reductions on Friday across its residential and buy-to-let mortgage range. The new rates will be made public when they go live tomorrow. TSB rates are also decreasing on Friday, with its two-year fixed house purchase mortgages going down by up to 0.45 percentage points. But some other TSB mortgage rates are increasing, including on product transfer deals and