Have you been to Little Sparta? I saw that Little Sparta was a big influence for the couple that created Jupiter Artland (and they have works by Ian Hamilton Finlay) - we went just before it closed for the winter and I thought it was incredible:
I've been the Jupiter twice and enjoyed both times. I'd known about Goldsworthy and he's why I went in the first place but have gained appreciation for others like Jencks etc.
The Garden of Cosmic Speculation, had me at its name. I'll be going along there to. Cheers, pal. Thank you very much.
http://www.littlesparta.org.uk/
Can't wait to go back!