Visit hertzoffers.com/amexuk

15% Discount & 900 Hertz #1 Points for next rental.

It appears to be for UK members only, although it doesn't say. It is a UK AMEX offer, but again no mention of having to pay with AMEX?

Book before 31st August, for pick up Sept 1st - 15th December.

Frustratingly I just made a booking last week (prepaid), but I've tried adding the PC for the free points retrospectively. It does say that booking must be made using the link though....