Booked a journey from Halifax to Kings Cross for the 24/04/2025. Did not realise that at Leeds we only had 10 minutes to change for the London train. I am over 70, so we are concerned in case the train from Halifax to Leeds was late, so we tried to change that part of the journey. We were told that was not possible. We had to make a new booking for the full trip which would have been far more expensive. They refused to change the ticket for the short journey to Leeds. The actual cost of buying an earlier ticket for the short journey from Halifax one way is £5 for two. We have purchased a new ticket for the earlier train from Northern Rail. Beware if you need to change any part of your journey it will involve higher charges. We will not use Trainline again. The man from the call center in India could only say. "Computer say's No".