The chance of the Norwegian Royals succeeding to the British throne is quite remote. King Harald (born 1937) is descended from Edward VII's younger daughter, Princess Maud. His family are presently #67-89 in the succession.
Descendants in the line of Sophia of Hanover → George I → George II → Frederick, Prince of Wales → George III → Prince Edward → Victoria → Edward VII → Princess Maud.
Victoria → Edward VII → Princess Maud → King Olav V of Norway
67.HM The King of Norway (Harald, b 1937) son of King Olav V of Norway
68.HRH The Crown Prince of Norway (Haakon b 1973) son of the King of Norway
69.HH Prince Sverre Magnus of Norway (b 2005) son of the Crown Prince of Norway
70.HRH Princess Ingrid Alexandra of Norway (b 2004) daughter of the Crown Prince of Norway
71.HH Princess Märtha Louise of Norway (b 1971) daughter of the King of Norway
72.Maud Angelica Behn (b 2003) daughter of Princess Märtha Louise
73.Leah Isadora Behn (b 2005) daughter of Princess Märtha Louise
74.Emma Tallulah Behn (b 2008) daughter of Princess Märtha Louise
75.HH Princess Ragnhild, Mrs. Lorentzen (b 1930) sister of the King of Norway
76.Olav Lorentzen (b 1985) son of Haakon Lorentzen
77.Christian Lorentzen (b 1988) son of Haakon Lorentzen
78.Sophia Lorentzen (b 1994) daughter of Haakon Lorentzen
79.Victoria Ribeiro (b 1988) daughter of Ingeborg Ribeiro
80.HH Princess Astrid, Mrs. FernerR (b 1932) sister of the King of Norway
81.Alexander FernerR (b 1965) son of Princess Astrid, Mrs. Ferner
82.Stella Ferner (b 1998) daughter of Alexander Ferner
83.Carl-Christian Ferner (b 1972) son of Princess Astrid, Mrs. Ferner
84.Cathrine Ferner Johansen (b 1962) daughter of Princess Astrid, Mrs. Ferner
85.Sebastian Ferner Johansen (b 1990) son of Cathrine Johansen
86.Madeleine Ferner Johansen (b 1993) daughter of Cathrine Johansen
87.Benedikte Ferner (b 1963) daughter of Princess Astrid, Mrs. Ferner
88.Elisabeth Ferner Beckman (b 1969) daughter of Princess Astrid, Mrs. Ferner
89.Benjamin Ferner Beckman (b 1999) son of Elisabeth Ferner Beckman