I'm sorry to hear that your train was cancelled. In this situation, you will need to contact Trainline customer service to request a refund. You can do this by logging into your Trainline account and clicking on "Contact Us" or "Help & Support" on the website. From there, you can select "Refunds & Amendments" and submit a request for a refund.

Alternatively, you can contact Trainline customer service directly by phone or email. Their contact information can be found on their website.

When requesting a refund, be sure to provide all relevant information, such as your booking reference number and the reason for the refund request. Trainline's refund policy may vary depending on the type of ticket you purchased, so it's best to review their terms and conditions before submitting a request.

Keep in mind that refunds can take some time to process, so it's best to be patient while the request is being reviewed. If you have any further questions or concerns, don't hesitate to contact Trainline customer service for assistance.

In addition, I recommend you to buy tickets on Trip.com. Trip.com now has a 5% OFF for UK train tickets and with great customer service. You can get the coupon on this link.

https://www.trip.com/trains/activity/2022/campaign/UK\_TRAIN\_SU\_230316