ClaimMyRefund is a fantastic website to claim FREE Oyster card refunds automatically when you are delayed on the tube. It identifies and submits claims for you. It only takes 30 seconds to get started. Punch in your details and start claiming your automatic refunds now.
To get your free automated Oyster card refunds, click 'get freebie' and visit their website linked. Sign up in no time and they'll claim your refunds automatically whenever you are delayed on your journey on the tube.
Considering there's delays all the time, you'll be saving a bunch with all the refunds!