You got the four regions:
-full marks for Australian 16th and 17th brigades
-full marks for Indian 99th and 100th brigades
-the 21st brigade was partly from Northern Rhodesia. It was called the 21st East African Brigade and consisted of 21st Infantry Brigade HQ, 1st Battalion North Rodesian Regiment (1 NRR), 1st/2nd King's African Rifles (KAR), 1st/4th KAR, 53rd EA Field Battery, 54th Nyasaland Field Battery (with eight 25-pounders), 54th EA Field Company, 58th EA Field Company, 2nd Zanzibar Field Ambulance, 5475 troops in all.
The brigade you missed was the British 16th Infantry Brigade, detached from 70th Division, but you were right about there being troops from the UK.
Well done. Over to you.