Ancestry, in partnership with the National Army Museum, has today published registers of soldiers effects between 1901 and 1929. The following text appears on ancestry.co.uk:
This is another good resource from Ancestry, albeit probably not giving a huge amount of new or useful detail in the majority of cases. The image above shows the entry for my great uncle, John Fredrick Nixon, who was killed in action on the 3rd October 1918 and appears to show that his father, my great grandfather, was paid a total of £26, 3s and 11d; a combination of back pay and war gratuity. I'm sure he would have much preferred to have had his son back.