If you want to fully grasp the pace and scale of expansion at LetsGetChecked, the at-home testing company founded by the entrepreneur Peter Foley in 2015, the best place to start is the company’s wage bill. Up until 2019, the company was so small that it did not even have to disclose the number as it filed abridged accounts. When it filed its first set of full accounts for that year, it disclosed a wages and salaries bill of $6.5 million. The following year, the figure rose to $22.3 million. For 2021, the last year that accounts are available for,…