Originally Posted by
navylad
Plea th of thme (perhaps too much), I'd be tempted to change to a plus fare rather than using Avios and then have an option for a same day flight change.
Why would Plus fare help here? OP is connecting TO the Norwegian flight, not FROM it.
Plus fare could possibly help if there are delays on the day and OP needs to change, but realistically it's unlikely OP would know that was necessary more than 1 hr before departure.