It's expensive. It's a pain in the arse for us and if we had any sense at all we'd drop the option.
It's £6.99 for cards /£7.99 for gifts. At that price it is costing us money.
If you order on Friday and expect delivery on Saturday you're in for a shock as it won't be delivered until Monday.
RM have a surcharge for Saturday deliveries and it's, quite frankly, rubbing salt into the wound.
Gift orders: Shipping is charged by weight.