Cashback & Shopping Points

Can I use my Cashback on my next order?
Do I also get Cashback on shipping costs?
Do I get Cashback and Shopping Points on the full price or on the reduced price after the discount has been deducted?
How do I know if I am collecting Cashback and Shopping Points on my purchase?
What happens to my Cashback and Shopping Points if I return a product?
How can I collect Cashback and Shopping Points?
For which products can I not collect Cashback and Shopping Points?
Do I also get Cashback and Shopping Points on my VAT?