Born on 9 October 1883 in Lambeth, his family moved to Wimbledon where Dimmer was educated at Rutlish School, Merton Park.

[2] A 31 year old lieutenant in the 2nd Battalion, The King's Royal Rifle Corps, Dimmer was awarded the VC for his actions on 12 November 1914 at Klein Zillebeke, Belgium.

[10] He was promoted to temporary Lieutenant Colonel in January 1918,[11] and was killed in action at Marteville, France on 21 March 1918 while commanding the 2nd/4th battalion of the Royal Berkshire Regiment.

After Dimmer's death, his wife remarried to Leopold Canning, a Royal Flying Corps lieutenant and future president of the British Fascisti.

[1] Dimmer's Victoria Cross and other medals are displayed at the Royal Green Jackets (Rifles) Museum, Winchester, England.