LONDON, Nov 10 (Reuters) - The number of people who have dropped out of Britain's job market since 2019 and who now cite a long-term illness or mental health problems has risen by half a million or about 25%, the Office for National Statistics (ONS) said.The BoE is concerned that the number of people leaving Britain's workforce will fuel inflationary pressures and the latest labour market data pointed to a record workforce exodus.Long-term sickness was the reason given by 28% of people who were neither working nor looking for work between June and August 2022, up from 25% at the start of the pandemic.However, most people who now cite long-term sickness as their reason for not being in work or looking for a job originally dropped out of the labour market for another reason.BRITAIN TRAILINGSeparate data showed that Britain is trailing behind almost all rich nations in its post-COVID labour market recovery and is on track to become the only major developed country with employment below pre-pandemic levels at the start of 2023."