Is Amazon Partnered Couriers Cheaper than UPS Drop Off Point?

Just creating my first shipment.
Does Amazon PCP (using UPS) work out cheaper?

I am shipping 2-3 boxes.
30x30x30
less than 15kg each.

I can’t find a rate card anywhere.

If I use UPS direct I can see it would be £5.49+VAT per box (this is based on getting a discount for taking it to a UPS drop off point).
Anyone know what the cost would be with Amazon PCP?