Yep, that's him - George Okey Tarr. Mum and I unearthed a fair bit of information about him on Sunday, after locating the plaque. His parents had an interesting story, as well - from what we've been able to piece together, it looks as if the late William Tarr did a bunk and left Margaret on her own with 7 children sometime after their move from Somerset to Cardiff; some years later she moved in with another man (listed on the census as his housekeeper, married) and had two children by him. William seems to have gone on to set up home with another woman back in Somerset and it wasn't until after he died that Margaret was able to marry this other chap, James Margate, and legitimise their two children.

I think George's name is on the war memorial in Grange Gardens, where my great-great-grandfather John Melean is also listed - must remember to go back there someday and check.