Thank you all for your comments and suggestions! I am fortunate to be in the position of having worked as a Registrar for the last 6 years, so I have a pretty good idea of what couples are looking for and what works/doesn't work!
I often hear of people who have been expected to use the venue's own services and caterers, and we hope to break this pattern by offering a DIY space where couples can bring their own ideas and create a completely individual event. We will be offering single day or whole weekend hire to allow time to decorate, have breakfast together the day after etc, and certainly have space to land a helicopter!
Sadly, no accommodation currently other than camping - which is certainly available, and we hope to add on camping pods/lodges in the future. However, we need to take things one step at a time!
We also agree with no corkage. Our couples will not be expected to pay corkage on table wine, welcome drinks or drinks for the toast but we have decided to run the bar ourselves, purely for practical reasons (not muddling up our own and hired glasses etc).
I currently plan to market mainly through social media and website listings - hence my request for the most popular ones to target - and we have a great website up and running!
Thanks again
D