I came across
this article today which I thought may be of interest to those people who use these cameras.
It's a list of recommended flash guns that can be mounted and used on the Fujifilm HS10 camera and apparently, although I can't be absolutely sure, are suitable for the S200 EXR as well.
These cameras have no TTL flash so it's manual modes all the way but if you've got one of these excellent cameras and want a proper flash, this might help.