Hi, thanks for replying so quickly! Timescale wouldn't be a problem - I've waited years on this, so a bit longer won't hurt!
This is going to sound a bit vague I'm afraid: SIMEON (sometimes Simon) STEPHEN JONES born in Llanrhaiadr yn Monchant abt 1820 died in Thornaby on Tees, but was buried in Llangollen. My last trace of him was in the 1861 census when he was 61, so (if he lived to old age) I'm guessing he would have died within 20 or so years after that. Sorry, I haven't been able to find any death registration for him.
His wife, ANN (nee Kynaston) JONES, born in Ruabon, Denbigshire in 1828, died in Ruabon some time between 1861 (when she was recorded in the census) and 1871 (when husband Simeon is recorded as a widower). After paying for three incorrect death certificates from the GRO, I'm afraid that again I can't tell you exactly which year - sorry. I'm reckoning that she was around her late 30's / early 40's when she died.
I appreciate that the name Jones is going to cause a problem, but if (as I think quite probable) they are buried together, then the Simeon and Ann Jones together might help identify them correctly.
Thanks if you can help, but if you feel that this is just too vague, then I quite understand.
John