Concerns over the UK government’s borrowing costs were revived on Friday after stronger-than expected US jobs figures triggered volatile conditions in global financial markets. In an accelerating global bond market sell-off, investors warned that the UK was particularly exposed amid growing fears over stubbornly high inflation and higher for longer interest rates. Almost 700,000 UK homeowners are facing an increase in mortgage costs when their fixed-rate deals end this year, according to research from property company Savills. At the end of a turbulent week in global markets, bond yields rose sharply for governments worldwide, before falling back, after the last