Mango Likes Loyalty Programme. How does it work?

[AmazonPrim]

I've got 2600 like on my account. Can anyone tell me how it works to redeem them (obviously I know you can redeem them at checkout), but how many likes = £1 off etc? I can't find anywhere that explains what the value of the points is.

I was wondering this the other day! Apparently it’s supposed to be £1 off per 200 likes. So 2600 likes should work out as a £13 discount at the checkout.