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I think Malcom Snell was the Salvationm Army corps officer at Chelmsford around 1960. His wife was Sweish.  Derek

Hallvard is certainly is a Norwegian forename. St. Hallvard (1020-1043), appears on the Oslo coat of arms and there is a street named after him - St.Hallvard's gate - in the old part of the city of Oslo., where there is also a church named after him. St.Hallvard was reputedly drowned in the Drammensfjord for protecting the name of a pregnant woman. Surnames as such were not commonly used in Norway until the 19th century this is explained at
http://www.nndata.no/home//borgos/names/htm
To suggest that all the Hallvards are related is too  far-fetched. The name Hallvard certainly has Scandinavia linguistic elements just  as numerous place names in the north of England, but this, I think. is as far as one can possibly go.

I don't think we can blame the delay in civil registration on a lowly clerk at the consulate. The father was obviously unaware of the system of registration in Norway at the time. According to routine  the births should have been registered at the church office of the parish where the children were born, no matter whether the children were to be actually baptised in the parish or not. The registration at the consulate was to give confirmation of citizenship for the children before returning to England.  It is not a question of using the National Library but the National Archives to find the Norwegian registration and here there should be no language problem as I use Norwegian in every day life.
Keep in touch and best wishes from Kristiansand in the very south of Norway

So the children were born in Oslo, then Christiania and there is no question of them being registered in Denmark. They might well have been baptised in the Anglican church in Christiania/Oslo,  St. Edmund's Church - address Møllergate 30, Oslo. Norway
website: www.osloanglicans.net