If you have the American Express Preferred Rewards Gold card, you will be benefitting from 2 x £5 monthly credits towards Deliveroo orders. This is worth £120 per year if used in full.
(If Deliveroo is not in your area, there is a way of swapping this benefit for £36 of real money. If you are in a Deliveroo area but never use it, this article shows how you can give your £120 to charity to buy meals for the needy.)
If you ARE using Deliveroo, it has teamed up with Amazon Prime for a decent deal.
Via this link, Amazon Prime members receive 12 months of free membership to Deliveroo Plus. Once you are signed up, you will not pay delivery fees on orders of £25+.
Added to the £5 cashback you receive per order (up to two per month) from Amex Gold, and it makes Deliveroo very competitive.
Looked at the other way, of course, if you currently pay for Deliveroo Plus but don’t have Amazon Prime, you could treat this as a (£3.49 x 12) £41.88 discount on your first year of Prime. You can sign up for Prime here.