Hi friends. We (myself and wife) will be arriving at Heathrow T-2 by an 11:30 AM Air India flight on 9th June (Friday). Our plan is to take a tube from there to King's Cross and take a train to Edinburgh (we already checked flying option from LHR to EDI but nothing is suitable with the kind of luggage that we will be carrying so train is the best option for us).
We are wondering how much time do we budget for reaching till King's Cross including immigration, luggage pickup and the tube ride. Assuming about 2 hours for immigration and luggage pickup, then getting to the tube and reaching King's Cross, is 4 hours a good enough time to reach the station?
We want to be extra conservative and keep maybe an hour extra that what is normally required. We have not planned anything in Edinburgh that night so reaching there a little late is also ok.
There are trains from King's Cross at 3:30, 4, 4:30 and 5 and we would like to purchase the cheaper advance fare so have to decide the train time now itself. Which train do you suggest we take out of the above options?
P.S. We would like to take a few minutes to pay a visit to platform 9 3/4 as well while we are at King's Cross so kindly factor in that time too.