Trying to identify a British cap badge

I am trying to find out which British regiments were training the 6th Belgian Infantry Brigade in the province of Antwerp in 1945 prior to operations Veritable, Grenade and Plunder. I have only one name of a Lieutenant
'Edgar Bill' or 'Bill Edgar'.
In June and later on in 1945 also there were British officers training the Belgian Infantry Brigades in Northern Ireland. Here I have a picture but I cannot identify the cap badges of the 1st and 4th man in the front row (from the right) (the other ones are Belgians)

 

Had a look but too small & blurry to iD.
Any chance of a more hi-res scan of their heads ?

 

This is the best it gets, 1200 dpi. (original picture measures only 3 by 2.3 inches and was taken
with a simple box camera)

Thanks in advance for your effort,

 

Officer in General Service Cap looks like he has Rifle Brigade cap badge.

 

Great,
Thanks a lot,

 

Correction of the initial post : which British regiments were training the 6th Belgian Infantry Brigade in the province of Antwerp in 1945 prior to operations Veritable, Grenade and Plunder. I have only one name of a Lieutenant 'Edgar Bill' or 'Bill Edgar'.

6th Belgian Infantry Brigade should be '11th Belgian Infantry Brigade, 3rd Battalion'

 

A sharpened image of the Officer's cap badge