Just made a few updates to this document.
Please feel free to make suggestions of anything that should be added, or corrections made.
helvella's Links and References document contains many links to other organisations
A single document containing numerous links to relevant websites. With a focus on the UK it nonetheless includes many non-UK sites.
Rather than a simple list of links, there is a page (or more) per site. This is intended to provide some flavour of the site before you decide whether to visit.
Can't follow links
