i am looking to go from Taplow to Lincoln on 5th August I get a good through advanced fare ^16.15 via Kings Cross and either via Peterborough or Newark. The Advance bit is presumably on EC so if I get the train from Taplow as stated on the itinery and it's delayed and I miss the connenction at Kings Cross can i travel on a later train?
Also coming back from Shireoaks? on Friday if I miss the connection at Retford
If you miss a train that's advertised as a connection and ticketed to you as a through journey on an advanced fare
due to a failure of the connecting train to make the advertised connection, then you're able to travel on the first available train run by the same company for which you hold the advanced ticket.
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So ... with an East Coast advanced ticket, a delay into Paddington such that you miss the train from King's Cross lets you drop back to the next available East Coast train. It doesn't allow you to travel on a Hull trains service if that goes out next, nor does it let you decide because you've been delayed and especially wanted to go on an
HST▸ service to hang around at King's Cross for an HST rather than an electric.
Similar thing on the way back ... although your question is slightly different. If you miss the connection because of a train delay, the same thing applies. If you miss it because you've queued in the buffet at Retford and the King's Cross train arrived and left while you were having your Pannini toasted ... or because you got caught short in the loo ... it's a different matter.
</pedant>
That's how I understand it, anyway!