Our local hort soc had requested a visit to HRH Prince of Wales's gardens (yes, hunker, this is how the apostrophes are positioned in their official documentation) several years ago. We received an official invitation a few months back, and 25 people went up today.
It was a really unique opportunity to look at some very interesting gardens, and if anyone else gets a chance I'd highly recommend you go.
There were several monuments / installations (temples etc.) to HM the Queen Mother, and it all had a lovely personal touch and was classy, creative and had great structure. Several wonderful follies. Prince Charles has made extensive use of reclaimed materials, felled / damaged tree roots, unused eclesiastical stone etc. and there are several large water features which are quite lovely. He runs a very green estate there.
There's also a shop and I have a Highgrove Long Tom pot and some Duchy cheese nibbles ! A great day.
Cameras are not permitted, but there are several books on Highgrove available through Amazon etc. with great pictures.