The Imperial War Museum has a nice film clip of Dublin before and after the Rising labelled "The aftermath of the Dublin Easter Rising, Ireland, 1916"
Links in to a number of my interests :
1. no Brodie helmets visible on or being carried by any of the British troops
2. one of the improvised armoured vehicles on film (this snippet also appears in Mise Eire film)
3. an ambulance is visible with the number plate RI-2700. Not showing up in the Irish Motor Directory listing for 1915 unfortunately. Full page of 1914/15 directory data here.