How about if you apply the bold part to yourself?? I mentioned it clearly that distance is b/w London and Moscow...and yet how you missed it is beyond me. You talk about geography and seems to have no clue about it...Here let me help...
https://en.wikipedia.org/wiki/List_of_cities_and_towns_in_Russia_by_population
Check where the major cities are located and then work out the range...and you don't necessarily have to fire every single missile from London...
Help me when you already have shaheen 3 which covers all of India then what is the use of other missiles and ranges??
P.S : Once again I am not trying to imply that MIRV capability has anything to do with distance as I have little knowledge in that aspect...however UK is very well a contender for a medium range MIRV which i believe is the point you don't agree with......