I have a mate at work who gets hung up over the stamp duty threshold. Hence he has been struggling to move for years, every time it falls through he consoles himself by splashing some money on new double glazing/new car etc. He could have covered the stamp duty by now.
Just forget its a tax, its a cost of moving. If you are max’d out at £270k, offer £261, and just state your situation to the sellers.
We are in a mid-terrace, desperate to move somewhere with a bit more space and not be able to hear everything that the neighbours get up to, but as the house prices have been static over the last four years we haven’t built up any equity for the next deposit, so we are scratching about trying to save up.