Could you tell me the best way to get a one-way train from Heathrow airport T5 to Cambridge on a Saturday afternoon? Is it correct to take Heathrow to Kings Cross, then buy a ticket to Cambridge (CBG)? But which ticket machine at Kings Cross? Do I look for National Rail, EastCoast Rail, or something else? Hopefully, it is automated and I can avoid staffed ticket windows and the long lines. I want the train that takes 1 – 1.5 hours to get to the train station near the city center.
(The Liverpool St. or Liverpool Stn. had 2 or 3 train changes so I don't want that.)