By David Milliken LONDON (Reuters) – British recruiters saw the weakest growth in hiring in more than a year and a half last month, as signs of an economic downturn made workers more wary about changing jobs and businesses more cautious about hiring, a survey showed on Friday. The Recruitment and Employment Confederation (REC) said job vacancies rose in September at the slowest pace since February 2021 – when many businesses still faced lockdown restrictions – while starting salaries rose at the weakest pace in 15 months. The Bank of England has been closely watching Britain’s job market for s…