Happened to us as well DT. My brother called me to tell me our Mum had disappeared, she been saying stuff about wanting to see her mum and dad, which gave us a starting point to look, I sent him off to check their old addresses while best beloved and I drove down to the town where they live, we left Queenie at home on phone duty. She was left to call all the relatives asking whether they'd seen her. We had to pass the local cemetery on our way so we checked there in case she'd gone there, no luck. We then went to check out her old childhood home, I had a vague idea of where it was but not the house number. We combed that area and were just heading away when we saw a young chap, with my mother on his arm. Brakes slammed on. Turns out she'd gone to her childhood home, which was unlocked and the chap found her sitting on his sofa! He wasn't able to get any real sense out of her, but she had taken the peg basket, full of clothes pegs and a couple of Christmas cards that had at least her address on them, after giving her some tea and biccies, they set out to find her house which was when we found them. I have no idea how she had even managed to get there as it was far from her house and she is crippled with arthritis so it can't have been easy, it was also freezing, and she had to cross a couple of really busy roads. How she managed it is beyond me. Since that happened we had sensors put on the doors to let us know when she left and keys were also hidden.