Does anyone know of any reputable LLM programmes in the US that
a) are one year long,
b) have environmental law-related content and
c) accept non-law graduates (i.e. from a good UK university)?

Thanks in advance!

DYR: http://www.llm-guide.com/search

I know about that, thanks. But there's no option for degree length and I'd like to know other people's opinions on this.

Most LLM programs are 1 year (unlike US MBA, which are usually 2 years).

Some of the best US LLM programs in environmental are:
- Lewis and Clark
- Vermont
- Oregon

Also check the US News rankings (which rank JD programs) http://grad-schools.usnews.rankingsandreviews.com/best-graduate-schools/top-law-schools/environmental-law

Many LLM programs are open for non-lawyers:http://www.llm-guide.com/article/213/llm-programs-for-non-law-graduates