Hilary has kindly provided a picture of the Hampshire Regimental Band at Watford in the summer of 1915.
I have added a picture of some London Scottish soldiers - who may be some of those who were the first territorials at the front and were slaughtered. (with quotes from the London Gunners come to Town).
There are also two pictures which may date from 1916, representing the City of London Rifles and Middlesex regiments, including one portrait of a single unidentified soldier. I have also moved the pictures of the Isle of Wight Rifles to another page.
It is now possible to draft an initial time line for Harry Cull's First World War photographs - but if you have any additional photographs of troops in Hertfordshire, especially where the unit, place, date and/or Hertfordshire photographer is known let me know as every little helps to improve the time line of which troops were based where in Hertfordshire, and when.