I went last year and had a brilliant day. You can read all about my day last here.
We will meet up outside on the grass area which is to the right of the main entrance (same place we sat last year). If you follow the main building to the very end you come to a lovely sheltered garden area. I will post a photo on Instagram and Twitter just before 1pm so you know roughly where we are. If the weather is not kind to us I will pop a post on Instagram / Twitter to let you know of the alternative arrangements.
Hope to see you there.