OK, here's a rough outline of options for the day. If anyone who wants to come along can let me know when you can get to the area I'll give a more detailed outline with some possible meeting places and times. I can't post links to every garden but if you use the general link to the open gardens organisation below you can see each of the gardens I mention.
I think the day need to start with the Roof Garden - arriving any time before 10 to get the most of it, if that's possible for you. After that we could look at nearby Iverna Court, then move on to the Sloane Square area, which will be handy for Irv's work, and which has some very nice squares, with some offering cakes and lunch. In that area we could tackle Cadogan Place and Square, Belgrave Square and Wilton Crescent. All of these are interesting gardens with a good range of plants and interesting architecture.
Hope to see a few of you on Sunday. The weather forecast looks good for the day. http://www.opensquares.org/