clearly martin the call is yours, £200 from main dealer or you could source one off ebay for £15
http://cgi.ebay.co.uk/VOLVO-S40-HEAD...QQcmdZViewItem
and allocate half a day to fix it if you are not mechanically swayed...i know which way i would go but if you dont fancy it, looks like you will have to bite the bullett......
as a point of interest (or not) when my 850 one went the wiper only moved when i turned the ignition on and off and then slowly, i turned the ignition on and off till the wiper returned to the parked position and i then disconnected it...for some reason having a wiper permanantly in the upright position, or just not right really bugged me....
cheers
jod