Many thanks to both Morgan and William. (I'm presuming it's ok to make a joint reply to you both? Forgive me if I'm wrong - still learning how Roots Chat works!)
Yes, I too had found the family in Street Issa, Ruabon in 1861, and Simeon (by now a widower) with his children in 1871 also in same place, and then again in 1881 in Thornaby on Tees. So yes it would seem Ann must have died between 1861 & 1871 as you say. No further trace of Simeon after 1881, so his death was obviously after that.
I'll certainly give Wrexham Register Office a try - thanks for the tip Morgan. Does it cost much for them to do a search for me?
Hi again William. You kindly helped me some time ago when I was trying to find out more about Plas Kynaston in Ruabon. I wrote off to Denbighshire County Council and the sent me photocopies of Dennis Davies' history of Plas Kynaston - very interesting & useful. I don't think that Ann herself could have lived there as my grandfather thought. The last residents, before the house went into other uses, were of another name: The last Kynastons to reside there were some time earlier. All my searches into Ann's family however (her parents David & Mary Kynaston) take me a bit further south to the Llanwddyn, Llanfyllin, Llangedwyn, Llanrhaedr ym Monchant area. The Kynastons who lived at Plas Kynaston seem to be related to those who came from over the English border into Shropshire (Ellesmere, Knockin, Kinnerley, Hordley & Wem). If I find a link between my Ann Kynaston and these, I'm starting to feel that it might be further back in time. However, it's still very intriguing that my Ann Kynaston lived so very nearby and that the family folklore says that (my) Kynastons lived there once?
All this said, I'm hoping that Ann and Simeon's grave might contain a clue.
Many thanks for your kind help.
John