We're flying into and out of Gatwick in April/May. We'll be spending most of our time in Italy. We get in on a Wednesday morning at 9. We leave the next morning for Venice. We're staying at an airport hotel. After sleeping off some jet lag, we'd like to spend the rest of the day in London. We will be spending 3 days there on our way back to the States. Suggestions, please, on best way to get to London and which station to exit from to be in a central tourist location for a one day excursion.
Thank you in advance!