When I got my Young Person's railcard, it told me this at the end:
PLUS - now you can claim your FREE Youth Hostel Association (YHA) membership!
Young Persons Railcard and YHA have joined forces to help you travel further and pay less to stay!
To claim your FREE one year YHA membership valued at £9.95 call: 0870 770 8868 (within UK) or 44 1629 592 700 (outside UK) and quote ATOC3.
Please check our latest Railcard offers for full details and terms and conditions.
Don't just sit there plan your next trip now!
At no point was I asked for my railcard number or any confirmation number..... I ahve my membership packet already!