So this wont apply to everyone, also this can be used on any order over £30, Pokemon just works nicely as it's £32.
This might be common knowledge but NOWTEN was the old promo that took £10 off your first order of £30+ it was replaced by NOWFIVE but I randomly tried this morning and my order went through. (don't forget to be a tight git and remove the £2 driver tip!)
First time orders as far as I know, enjoy!
Edit 1: Prime Now is Amazon's 1-2 hour delivery service, it's a separate app on your phone (requires Prime) and this was a promo they ran for first time orders. It is only available in certain areas though unfortunately.
Edit 2: It appears to work again, even if you previously used it.