WWI hospitals in UK

[CathyJ]

Hello, I am researching my grandad who joined the York and Lancaster Regiment in Aug 1914 from Darwen. He was gassed and eventually sent home to a hospital in Cheddon Road, Taunton. Some sort of sorting place perhaps. He must have gone to Sunderland for treatment as that's where he met my Nana. Has anyone an idea of which hosp he could have ended up?

He was discharged in Sep 1919.

Just wondering if any members had researched similar.