Over 60% of WW1 service records were burnt in the WW2 blitz. Herbert's has not survived but Thomas's has (see MaxD's reply above)
He served with Duke of Edinburgh's (Wiltshire) Regiment service number 19610
Enlisted 1914 aged 19
There are a number of images which you can view at your local main library if they have Ancestry access
There are Medal Roll Index entries as follows
Herbert Prestidge Royal Field Artillery Regimental Number 10598. Theatre of war Egypt entry 17.7.1915
He was awarded the British, Victory and 15 star medals
Thomas Gilliver - lots more numbers
Duke of Edinburgh's (Wilthsire) Regiment, Oxfordshire and Buckinghamshire Light Infantry, Labour Corps, Royal Engineers, Royal Engineers
Regimental Numbers 19656, 116111, 342321, 317646, WR/341354
Theatre of war = France 15.5.15 He was awarded the British, Victory and 15 star medals