Duel citizenship

Hi,

I really hope someone can help as I'm struggling to find a clear answer on the UDI website.

I am a British citizen and I'm hoping to gain duel nationality with Norway now that they have changed the law.

My situation is as follows:

My mother is Norwegian and my father is English, they met and got married in Norway whist my mother was expecting me, they then moved to th UK where I was born in 1976.

Although I was raised in the UK we spent most of my summer school holidays in Norway staying with my grandmother and elderly aunt and I always considered myself to be half Norwegian.

I did not find out until I was approximately 24 that I lost my Norwegian citizenship as I did not apply to retain it before I turned 22, I was not aware of the laws and was absolutely devastated to lose part of my heritage.
Luckily for my brother (who is three years younger than me), he managed to get the paperwork in before he turned 22 and therefore retained his duel citizenship.

I will apply in February but from what I gather I will not be successful, does anyone have any information which could help my application?

Many thanks

Kristian