The roads are tight for caravans , once you get off the main road. I've taken my caravan there a few times, You turn off main road onto carew lane..go past carew castle and over the estuary bridge..sat nav tells you to turn left immediately after you cross, but carry on, on carew lane, up the hill about half a mile or so. You see a little garage fixing land rovers on your left, with a big boat sat in its carpark, immediately after that, there is a left turn ..don't know name of that lane...follow it until you come to a left turn onto rosemary lane. This is where it starts to get narrow... follow it all the way down, until it feels like you are entering a private farm yard..but you're not, there's a telephone box in front of you and you follow the road round to the left...carry on about half a mile, slowly, and you'll see Tything barn sign at the side of an opening..
That's a site I have not tried and want to. I was hoping to get a few pals together for this also. May wait until the weather gets a little better though. June should be nice. Up for trying a few sites this summer.