I've booked a couple of weeks off work in July.
The nearest thing to a well-formed plan I have so far is to wander around Kew Gardens sometime on a weekday and see what there is of interest to photograph. (They don't allow photography at weekends.) Company not unwelcome, but I might not reliably pay much attention to you unless you look particularly interesting at high magnification.
I'm also open to suggestions of other places to go that have interesting things to photograph (not necessarily ultra-closeup shots like I've been taking lately).