Britons Camp, St Albans

It is clear that there were still some tented camps after April 1915, but it is often hard to tie them down. The postcards on this page have no identifying information apart from the title "Britons Camp, St Albans". They come from a collection of material relating to the 2/4 Leicesters battalion. 

I am trying to establish when the troops were in the area, and where the camp was..