By contrast today's Civil service is about 550,000 governing a population of 69 million [3]. Of course it must be pointed out that todays government does more things for better or worse, so it's not saying they did the same with a few orders of magnitude fewer people. But still, seems pretty effective to me.
[1]: Paul Johnson, The Birth of the Modern: World Society 1815–1830: "At the Colonial Office in 1816, there was a tiny establishment of 14: the Secretary of State, Earl Bathurst, his Under Secretary, Henry Goulburn, MP, the Permanent Secretary, a librarian, a translator and nine clerks. According to Goulburn, 'several' of the clerks were employed on slavery-law enforcement duties all the time. The enforcement of the antislavery law seems to have had priority over any other policy objective."
[2]: https://en.wikipedia.org/wiki/Colonial_Service
[3]: https://www.gov.uk/government/statistics/civil-service-stati...