Thank you for your help. I contacted SHC and they do have a paid research service but with their fees it'd be more worth my while visiting in person. However, now knowing that his wife wasn't buried there, it seems unlikely that he would've been either.
I phoned East London Cemetery, Plaistow a few years back and they couldn't find him there but advised he would've been buried at Bow Cemetery. I searched there with no success either.