Laws
- Norway is a member of the EEA.
- Needed: reference to law that implements Directive 2004/38/EC
Schengen
- Schengen Visa Rules and Border Entry for family of EU citizens
Government Information
- EU/EEA/EFTA information from www.udi.no
Other things to note
- People with “British passports with unlimited rights to enter and stay in the UK” do not require a visa for visiting Norway (see Others exempt from visa requirement)
freedom of movement in the EU 
Comments
Just to add to the above comment – “it’s not people who live in the UK and have indefinite leave to remain that don’t require a visa for visiting Norway” but British passport holders with ILR – there is a difference.
Norway have incorporated Directive 2004/38/EC in their Emigration law of 2008. Utlendingsloven Chapter 13 i saying: ”Familiemedlemmer til en EØS-borger omfattes av bestemmelsene i dette kapittelet så lenge de følger eller gjenforenes med en EØS-borger” This basically says that a any familly member of EU/EEA citizen have right of free movement as long as they travel with or to join the EU/EEA citizen.
http://www.udiregelverk.no/sitecore/content/Home/Rettskilder/Sentrale%20lover%20og%20forskrifter/Utlendingsloven/Kapittel%2013,-d-,%20S%C3%A6rlige%20regler%20for%20utlendinger%20som%20omfattes%20av%20avtale%20om%20E%C3%98S%20og%20EFTA-konvensjonen.aspx
This is also clearly stated in the UDI operations Manual (Utlendingsforskriften) Chapter 19
http://www.udiregelverk.no/default.aspx?path=BDA7AF5B-6524-4333-A6EE-27D998A38C8F#ID1E0BB0VEQEDFA