I know this fresh deal had been posted in the past, but with 20.00 off your first order, some people may have missed it first time round.
If Amazon Fresh is available in your area you can be eligible for a 30 day trial if you have Prime, or you can sign up to the 30 day free Prime trial and Amazon Fresh at the same time. If you spend over £60 you can get 20.00 off by adding the promo code SAVE20 on the payment page. Delivery is free over £40 so it seems like a good deal if you can get it.
I believe it is available in London and many many places all over the UK and I'm sure it will be rolled out to more places like PrimeNOW has. So this is also a heads up for those outside the eligible area.