You are not wrong. Evidence has shown that height decreased in Britain in the early nineteenth century, before beginning its long increase around mid-century. Increase in height has not been constant; however. The European Middle Ages was an era of tallness with men of above six feet (1.83 m) considered unremarkable. In Europe human height reached its nadir at the start of the 19th C. Until the general rise in human health, as urbanisation increased, the accompanying trend was a height decline.