Hi all, I've been off for a while - enjoyed the rest of our week in Cornwall, returned home and limped through a week at work, but it's finally the weekend and I have been awake since far too early, so enjoying a bit of quiet time before the DCs wake up.
Sugarplumtree, so sorry to hear about your mother. 
SeaRabbit, we did go to Chysauster and it was fab! We were the first people to arrive, and the DCs spent a very happy hour running around noisily, before other visitors started to turn up. It's an amazing place, isn't it? We went from there to Trengwainton, but of course by this time the requests to go to the beach had started, so we didn't stay very long. We did enjoy the paths winding through some spectacular tree ferns, and a display of WWII things in the walled garden.
Our lunch stop on the journey home was Killerton in Devon, very beautiful herbaceous borders.
The discussion of washing machine gardens has been most illuminating. I love that circular York Gate garden, shovetheholly! But realistically, there are so many projects that have to take priority over spending anything at all on decorative hard landscaping in our front garden (ancient cracked concrete/weed driveway and crumbling retaining walls in the back garden being the main ones), that I am going to embrace the centrifugal.
I have another question now, about planting. The only rule I am really on top of is 'taller things at the back' - now enhanced by funnyperson's comments about see-through planting and varying heights from left to right. You knowledgeable people speak of 'National Trust' planting and putting things in threes, and I think there might be rules about the total number of different plants to use, and repeating the same plants in different places along the border.
I have a long (and expanding!) list of things I would like to grow, but it would be useful to know any rules of thumb for translating this into a plan for our small space. To extend the washing machine analogy, at the moment it's not just the overall shape of the garden but also the colours/sizes of the plants that resembles a mixed load of laundry.