His service record appears to be among the 70% of Great War records destroyed in the Second World War bombing.
His medal entitlement was the 1914-1915 Star (as Jim says, service at Gallipoli arriving there on 11 Aug 1915), the British War and Victory medals and, as you know, a Silver War Badge having been invalided out in March 1916.
The 7th Essex became a Territorial Force battalion having been until 1908 a Volunteer battalion
https://en.wikipedia.org/wiki/7th_Battalion,_Essex_Regiment. The link describes also what they did after Gallipoli.
As there is no service record for him, his service, if any, after invaliding out cannot be established. Equally, a record for any service in World War Two would still be held by MOD and can be applied for
https://www.gov.uk/get-copy-military-service-records/overview maxD