Sandy,
Luckily for you I’m nerdy enough to have a copy of the medal roll for the 10th London Regiment! The details for 421119 Pte. Frederick Harris are as follows:
2(b) 6.8.15 to 13.12.15
4(a) 18.12.15 to 18.3.16
4(b) 19.3.16 to 19.1.19
In layman’s terms 2(b) is Gallipoli, 4(a) is Egypt until March 1916 and 4(b) is Egypt and the Palestine Campaign. All in all, Fred was pretty fortunate to have remained with the battalion from Gallipoli to the end of the war as the 1/10th Londons took particularly heavy casualties at Suvla Bay in 1915 and 2nd and 3rd Gaza in 1917.
Regards,
Steve