Peter Falk and son Christian Falk

I am trying to find any information at all about Peter Falk from Kristiansund who had a son Christian Falk in1841. Christian was born in about 1841 0r 1842. Christian came to England and Married Elizabeth Biggs in 1868. he became a Police constable in Burton Upon Trent England. He appears in the English census in 1871,8181,8191, and 1901. They had two sons, Joseph and Edward. Elizabeth died in 1904. Christian died tragically in 1908. I have been round in circles for years trying to trace how Christian came to England and how/when he became a Naturalized British Subject. any help at all would be amazing . thank you. Caroline Falk