I don't wish to nit pick Doris, but you could have given a little more detail. Which London are you referring to ? London - Pope County Arkansas US London - Madison County Ohio US London - Freeborn County Minnesota US London - Monroe County Michigan US London - Laurel County Kentucky US London - Sumner County Kansas US London - Tulare County California US London - England London Grove - Chester County Pennysylvania US London Mills - Knox County Illinois US or some other London ?
There's a long way and a short way depending on whether you choose to travel easterly or westerly around the globe, or have a choice between southerly or northerly.
Doris it would appear that nobody is taking your question seriously. I assume that you wouldn't have asked your question if you didn't expect a proper answer. So, you sit there mate and I'll go to London and report back to you with the distance involved.