I found that my new code A460200 beat the regular line up that I use. I double checked and this is not my old NMA code. I have no idea how this wound up in my profile. However, I found a better deal for National with my standard Emerald Aisle discount.

It was GBP 100 at Aviss for a compact car for three days incl tax and fees with this code. (I get always get upgraded generously by Avis in the UK as Pref Select so just pick the cheapest.)

I noticed that taxes and fees were about GBP 10 higher for Avis. Maybe National is more "off" airport than Avis.

I know that National at CPH doesn't have a desk at the airport so they don't have to pay fees to CPH. But you have to give them the flight number so that they can meet you. The woman parked illegally outside as well..... it's quite a shady operation at CPH.