Thank you all for your help. It looks as if wipers have been reassembled wrong prior to me buying the camper.
Once again thank you, and all of you have a Merry Christmas and an Enjoyable New Year. DennisC

I have tried to find the info about the length of the actual wiper arms for the front windscreen. Even with the correct length blades, the drivers side blade still overlaps the top of the screen by about 140mm. Does anyone know the correct arm length.