The soldier is not the 1st Bn as they were not in India between 1908 and the late 1920s when the belt/badge were in use:
1908 Aden
1910 England: Warley
1912 Borden 3 Bde
1914.08 France and Flanders 1 Div
1914.11 France and Flanders I Corps
1915.07 France and Flanders 2 Div
1915.12 France and Flanders 33 Div
1919 England: Aldershot
1920 Ireland: Kilworth
1921 1st Battalion, The Queen's Royal Regiment (West Surrey)
1923 England: Aldershot 6 Bde
1925 Dover 10 Bde
1927 China: Shanghai
1928 Hong Kong
The soldier would be a likely contendor to be from 1/4th TF or 1/5th TF Bns according to the LLT website which records the RWS TF Bn's locations in India in WW1:
http://www.longlongtrail.co.uk/army/...rrey-regiment/