Just a little extra to the Bentley - Forbes Rankings . County accounts for those counties organized as mutual companies can be obtained, free of charge, from https://mutuals.fca.org.uk/ As well as the accounts themselves the mutual counties file an annual return which includes the number of members at the end of the year. The table below summarises the information. County Members Surrey 9,547 Nottinghamshire 7,454 Somerset 6,250 Lancashire 5,194 Yorkshire 4,557 Essex 4,524 Warwickshire 3,597 Gloucestershire 3,589 Kent 3,212 Worcestershire 3,025 Sussex 2,770 Glamorgan 2,446 Derbyshire 1,926 Leicestershire 1,250 Total 59,341 I'm missing Hampshire, Northamptonshire and Durham, which aren't mutuals and Middlesex, which seems to have given up on filing accounts. I'd guess these four counties would have about 8,000 / 10,000 members between them so a total membership a few thousand shy of 70,000. If you assumed £200 per member that's an a...