How long will it take by taxi from London kings cross station to London paddington station?
The distance is only about 3 miles but it can be a very busy route so anything between 10 and 40 minutes dependent on the time of day.
There are quite a lot of main terminus stations in London and the one that you would use would depend on where you are travelling to or from. They include London Bridge, Waterloo, Victoria, Paddington. Marylebone, Euston, St Pancras, Kings Cross, Liverpool Street, Charing Cross plus dozens of smaller ones.
Clapham Junction is apparently one of the busiest in Europe by number of trains with 180 trains per hour at peak of which 117 stop and it has the most interchange traffic. By entries and exits the busiest station in the UK is London Waterloo. The physically largest by ground area will be one of the major London termini, probably either St Pancras, Kings Cross, Waterloo or Paddington.
KINGS CROSS STATION and to some extent Platform 9 3/4 There is a belief that Boadicea was buried between platforms 9 and 10 in King's Cross station in London, England. There is no evidence for this and it is probably a post World War II invention. And Harry Potter leaves for Hogwarts from platform 9 3/4 in Kings Cross station