Do not use this website! Their website is not reliable. For me, they did not complete a transaction for my single train ticket. I did not receive a confirmation email, money was taken out regardless, I missed the train I wanted to get and I missed work that day. It was a hellish morning.
Also if you go onto the ticket splitting website via moneysupermarket.com, they are cheaper. For example a Rugby-Glasgow single ticket was £49.50 with TicketySplit via Money Saving Expert but it was £52.10 with Raileasy. £2.60 cheaper pretty good especially when it's coming from a more reputable website.
Hope this helps anyone who is tirelessly fighting the increasingly expensive price of train tickets!