I was at school with a Clive Arnsten in Cape Town. He was born in 1966 (I think). His dad was Ken Arntsen. Ken was the son of "Johnny" Arntsen and was born in Cornwall. Arntsen is not such a common surname, so there may be a connection to Thor Arntsen. Clive's info is on www.geni.com = you may be able to contact him via that website and ask his directly?