By Jon Robinson The founder of one of the UK’s most active land promoters has further increased his stake in property developer Henry Boot. David Gladman, who is estimated to be worth more £200m, has upped his stake in the listed group from nine per cent to more than 10 per cent, according to a new filing. Gladman founded his business in 1986 before it was acquired by Barratt Developments for £250m at the start of 2022. The increase in his holdings in Henry Boot further strengthens his position as the second largest shareholder in the group. Rysaffe Nominees and J J Sykes, in a joint holding, …