Check this site out :D
http://www.upvc-hardware.co.uk/coldseal-m-29.html
I have bought hardware bits and peices off them for my upvc windows and doors in the past. I have done a bit of searching on their online store and copied the link direct to the product i think you will need...
You lucky so n so. If it has damaged your lock barrel at all I know where you can find a replacement. I bought one online a few weeks back and was pleased because I fit it all myself :lol: and didn't need to pay a lockmith.
They look just like the ones in masona's photo and I bought them...