Dear Coco,
I'm a london based mask maker. I know mike Chase who Alan mentioned. He used to be based in London and but now is based in at the Glasshouse Arts Centre in Stourbridge outside manchester. I teach mask making at my studio. So if you get in touch with me we can work something out.
You can check out my company website: http://www.lyingwiththeanimals.co.uk/
and for images of my masks: http://flickr.com/photos/84881877@N00/
best wishes
Steven Whinnery