Thanks Andras for the quick reply.
There is still the problem of not being able to delete items from the cart.
Also, the cart’s cookie management doesn’t seem optimal. I can’t expect users to be manually deleting cookies in their browser. I realise this is more a WooCommerce thing.
Sorry, I thought that this solution was going to save me time but it is starting to look the opposite. Built on a stack of four plugins, I have a gut feeling that something is always going to be breaking.