Originally Posted by Misco60

Avanti is a very pleasant way to travel, and your son will get a 50% discount on the usual fare as he is under 15. No railcard required.

Standard class on the train is pretty much the equivalent of Eurotraveller and Club Europe in terms of personal space and legroom. Standard Premium is a first class carriage without the food and drink service of full first class, and good value. First class is probably wasted on a 13 year old.