Amazon are currently offering £10 of qualifying products over £75 and £5 off qualifying products over £40.
Codes are as follows:
Pro edition £10 off: VG10OFF75
Normal edition £5 off: VG5OFF40
Expires 7/5/17. All details available here: https://www.amazon.co.uk/gp/promotions/details/popup/A8C7D6Q74G04E
Unsure, at present, how the discount would work with the price being reduced over time. As far as I can tell it's £10/£5 of whatever the lowest price is at release because the code shows up as a £10/£5 voucher when entered at the final page.