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Do be aware that most of the Leeds to Kings Cross trains that call at Grantham do not call at Peterborough, so a change of trains at Grantham will likely be required.
How amusing that the withdrawal of this EC&Connections fare is actually going to cost EC £90 per trip from FlippyFF rather than gain them the £20 or so they hoped!
These are the difference between the Anytime Single and First Anytime Single. The reason for some being cheaper is that EMT could have risen the price of the former more than that of the latter on those flows over that time period.