Found 18 retailers starting with "i"
7.5% Cashback 
9% Cashback 
5% Cashback 
28p Cashback 
Up to £2.50 Cashback 
Various Cashback 
£21.50 Cashback 
£17.50 Cashback 
7% Cashback 
£16.50 Cashback 
£17.50 Cashback 
3% Cashback 
3.25% Cashback 
3% Cashback 
Various Cashback 
35p Cashback 
2% Cashback