I have searched the Mac ... deleted a couple of other old accounts (ones I've used for 'testing' and things) - I cannot find reference to "Twynham" (old address) anywhere on my Mac ... anyone any thoughts please ?
Hi Jon ... I eventually got through to Apple 'chat' support in the States and after several people tried, without success, I was passed onto a supervisor who showed me where there were some data 'caches' that I deleted - I'm really sorry I didn't spot where the folder was.Did you ever figure this out? I noticed this happening myself recently. I just moved, changed my address in my contact form. But when I tell it to autofill my home address in Safari, it's filling in my old address still. Really annoying.
In case anyone else is still having this issue, I was able to resolve it by:
1. Signing out of iCloud
2. Removing all files with "com.apple.safari" in `~/Library/Caches/`
3. Removing the folder `~/Library/Safari/`
4. Restarting my computer
5. Signing back into iCloud
6. Restarting my computer again
Hope this is helpful.