90th Training Reserve Battalion

[dyoung]

I am researching my grandfather who served in the KOYLI in 1917. In particular his enlistment and training in the UK prior to being sent to France

He trained at Seaton Sluice / Seaton Delaval, Northumberland and there is evidence to suggest that this was in the 90th TR Battalion in late 1916 and early 1917

There is some basic information on this unit in the appropriate sections of 1914-1918.net.

Is anyone able to shed light on what the primary source for this information is as I would like to view it if possible.

In particular, the move to Blyth in September 1916 as this does not tie in with his recollections?

Thank you