1900 Dec 7. Born in Plaistow, West Ham.
1901 census at 1 Liddington Rd, West Ham
1911 census living at 2 Corporation St West Ham, but sometime before 1914 the family moved to Barking, Essex (as shown on his brother's service record).
1920 Dec 11. Died in Belfast Military Hospital. His death cert points to a 1900 birth, so he did not lie about his age to enlist
1920 Dec 20 Horace is buried in an unmarked grave in Rippleside Cemetery, Barking. The death certificate shows that Horace Anderson fr. Londonderry died 11/12/1920 in Military Hospital, Clifton St, Belfast, profession or occupation being Soldier [no regiment given]. This appears to show he was stationed at Londonderry at the time of his admission to hospital. He died of complications following an abdominal section to remove a pancreatic cyst.
His brother had served with the Dorsets during the war
The MICs reveal 24228 Private Horace C. Anderson, Norfolk Regiment. Could this be him? The MIC shows this chap to have been in 3 regiments. 242283 Norfolk Regiment; 260135 Worcester Regiment; 43505 Suffolk Regiment. It appears unlikely that a man born Dec 1900 would have had time to be in all those regiments
On balance he would seem to be a Dorset soldier and not the MIC Horace C Anderson. And that he did not serve overseas, and did not have a MIC. The CWGC has accepted him as Dorsets.
Irish GRO ref vol 1 , Page 122