By Jack Barnett Wild swings in UK debt markets and concern over borrowers’ capacity to pay costlier mortgages have whacked London-listed housebuilders and banks this week. Britain’s biggest property developers have been among the hardest hit listed companies during this week’s market sell-off. FTSE 100-listed construction firms Taylor Wimpey and Barratt Developments have shed more than 20 per cent each since the mini-budget. Downbeat market sentiment spread to other segments of the housing sector, with property search site Rightmove tumbling 18 per cent. Traders are cutting “their exposure to …