Why not make a listy thing of those who want to go along with their nearest city then google the miles between the furthest north peeps and furthest south peeps and drop a pin in the middle.................or not.
Please.
Let's not start this argument again.
There are at least half a dozen places claiming to be the centre.
It all depends on what you include in the whole. Orkney? Harris and Lewis? Shetland? Rockall? Channel islands? etc. etc.