This is a fantastic thread!
Bangor on Dee/Bangor is-y-Coed (not sure if they're the same place or adjacent)
It is the same place - English name and Welsh name. It is indeed near Wrecsam/Wrexham!
I thought Thirsk was in Scotland until we drove through it in Yorkshire.
Truro is the one that always gets me. Even though I know it’s not, I’m still sure it is in Scotland, not Cornwall! No idea why, but I can’t get my head around it.
If you travel from Thurso to Truro via Thirsk, you'll have a mighty long (but wonderful) drive from the very top to the very bottom of Great Britain!
Gillingham - up north, maybe near Burnley or Blackburn or something.
Do you mean the one in Kent (pronounced Jillingham) or either of the ones in Dorset and Norfolk (both pronounced Gillingham)?!
I’m always amazed that when I’m in north Norfolk I’m further north than Leicester and Birmingham.
Never mind that - far more mind-blowing is that, if you travel from Leicester or Birmingham to Norwich, you've travelled to the other side (hemisphere) of the world!
West/ East Midlands always seemed an odd split. North/ South Midlands would just sit better.
The traditional dividing line is silly, as it's kind of diagonal rather than vertical. In fact, if you take account of the fact that Britain 'tilts' a lot more to the west at the top and the east at the bottom than most maps suggest, it's probably not that far off approaching horizontal! How can Rugby be in the West Midlands and Buxton be in the East Midlands?!
Slightly different but i thought that Magaluf was pronounced Malaguff.
'Malaguff' would be the second-best ever name for an authentic curry house, pipped only by 'Earth, Wind & Fire' 
So Australia is actually in the Far East!?
It always amazes me to think of the north of Australia is not all that far from the Equator. I always think of it as right down in the bottom right corner!