@thetrainline Ankita from your call centre reassured us we'd be able to use our tickets from the cancelled train, these were then declined at the station. You can clearly see my frustration as i followed trainline's advice and now am £156 out of pocket.
@thetrainline I'd like a £156 refund as I had to pay to purchase additional tickets to get me and my sister to Heathrow please! This was as a result of not being allowed on an alternative train with our tickets as advised we would be able to by Ankita when I rang you in advance for advice.