National Railcards provide a range of discounts. All provide a third off travel. There are several different schemes:
16-25 Railcard - discounted travel for 16-25 year olds.
Two Together Railcard - discounted travel for two named people travelling together.
Family and Friends Railcard - discounted travel for those travelling with children.
Senior Railcard - for those aged 60 or over.
The Disabled Persons Railcard - If you have a disability that makes travelling by train difficult, you may qualify for a Disabled Persons Railcard. You can also book assistance for your journey via the disabled persons' railcard website.
Please see website for further details. Available at all main line train stations e.g. Kings Cross