Your first 15 Lifetime Recruits (before you were an SR) earn you 500 payback points. Those points are payable In December and June. Those Recruits do not earn you any SR Rewards.
Lifetime Recruit 16 and onwards do not earn you the 500 payback points. They instead earn you SR Rewards if they purchase a topup✶ again for a 2nd or 3rd time. These purchases must be on different days and need to be within 120 days of them activating their SIM.
✶ Purchasing a plan (goodybag) of at least £10 in value also counts towards the 2nd and 3rd purchases as long as they were on seperate days, within 120 days of their SIM activation, and weren’t purchased using existing credit.