I have been to London last week. Other than meeting with my former employer LMK Media visiting their offices in E1 Studios and having classic British Fish&Chips together I met with Edwin and his wife from Diomedia.com
Edwin pointed out that he is looking to expand his already successful offerings in the fields of agriculture and medicine looking especially for doctors, scientists and farmers to expand the Diomedia.com offering.
As far as licensing is concerned he has plans to go "Back to Roots" of classic Rights Managed licensing for the pictures.
Photographers do not necessarily need to be full-time photographers but specialists in their field you have a photo collection in the specific fields of medicine and agriculture.
Sounds interesting? I will be happy to get you in touch with him as we are all very keen on not publishing under a Microstock licence as we strongly believe that these types of photography do have their specific value. Edwin also has relations to enforce the copyright of pictures should your images be stolen from the web.