Topic: Upgrading to Expansion

Hi, I have 13 months of an individual sub left and to upgrade to expansion, Nintendo wants £19.

I also have another code for 12 months individual. If I add this to my account, will it effectively reduce the upgrade to expansion amount from £19 to around £4?

Thanks

Anyone know?

That depends on their TOS that is something you need to contact Nintendo support and ask them how does another code or extra add on or start at where the old one stops.