I cannot think of how many charities this will affect. Almost without exception, every small or medium UK charity I know uses Drupal in some way for their work.

I cannot think of how many charities this will affect. Almost without exception, every small or medium UK charity I know uses Drupal in some way for their work. These are usually customised for a specific project, and some of these will have donation facilities built-in. The worrying thing as always is that few people upgrade these instances once they are launched and operational.