My husband and I will be in England and Scotland for the first two weeks of June, and I need to buy train tickets for three relatively short trips (each on a different day): London to Nottingham, Nottingham to York, and York to Edinburgh. In London, we will be staying in Chelsea, a short walk from the South Kensington Tube station, and from what I can tell we will need to get to Kings Cross St. Pancras Tube station in order to take the train to Nottingham. This is our first time traveling by train in Great Britain and only our second time in London (and that was only for two days). About how much time should we allow to ride the Tube from South Kensington to Kings Cross St. Pancras, and how early should we arrive there in advance of the train departure time?
My thought is to purchase "Advance" tickets due to the savings in cost, but will that require arriving even earlier? Not so worried about logistics in Nottingham or York because they are smaller cities, but is there anything I'm not aware of that I should consider? And lastly, we are both over 60. Would a Senior Railcard be a good value?
Thank you.