The Poppy Cross have him serving with the 18th Hussars.
The only Patrick serving with the Hussars listed with the Commonwealth War Graves Commission (CWGC) is the following
Private 8074, Patrick Thomas Kelly 19th Hussars, died 14th April 1918 aged 25. Son of Emily Kelly of 4. Notley Street, Canterbury, Kent and the late Patrick. Born in Bangalore, India. Buried in Grand-Seraucourt British Cemetery, Aisne, France
This memorial is at the National Memorial Arboretum, Alrewas, Staffordshire