1) Sign up to CompleteSavings *via the Trainline app in the favourites section at the bottom*- it is £15 per month, this gets refunded if you make any purchase
2) You can purchase a 55p train ticket (Stourbridge Junction to Stourbridge Town - Child) at Trainline.
3) Submit the details about your purchase in this section to get the £15 back:
Gift cards with 20% off can be purchased once per month. This site offers high cash back rates, at least 10%.
Take a look at @NeoBids deal to find out how to also get £45 free: hotukdeals.com/deals/45-cashback-at-trainline-how-to-get-20-off-anything-at-argos-3203594