Just an update: I ended up sending the cameras to Newton Ellis & Co because the answered my e-mails promptly and appeared eager to repair my cameras. They also had a fair price (130 incl shipping fee and VAT for both cameras). They also accepted PayPal so that made things easier as well. Repairment and shipping was fast - 1.5 weeks from sending to receiving the cameras!
Now, someone may think if it was worth it? For me, yes. Both cameras are fun to use and slip easily in to the pockets of my jacket, they are all manual, battery independent, and will hopefully last for many years from now on...