Just booked my travel for the Arabs in september. £7 each way with a 16-35 railcard, so probably about £10 for a standard adult.
virgintrains.com, leaving about 9am and coming back about 7pm. There's only a few super cheap trains left but get booked up and you'll get a good price. Only 2 hours from Euston and nice trains.
See you then

yup i saw these not 100% if i can make it thou