Just to note, though, that you can book tickets with Trainline, which you can't with traintimes.org.uk, it does have limits :) However, Trainline charge a booking fee – https://ehelp.thetrainline.com/app/answers/popup_detail/a_id... – and so I would suggest using any train operating company site (they all sell nearly all tickets), whichever one you find most agreeable.