Hmm, what else is a tricksy biennial, and I hadn't noticed? 
I may need to revisit my list of lovely bee-attracting plants, and make sure that they are all annuals that will flower in time!
I spent a couple of power hours at the plot today, clearing off all the branches and bits of apple tree. And rubbish, and... stones. 3 HUGE and heavy buckets of harvested stones schlepped to the tip today, wih another one left, and more in the ground left to collect.
My allotment is still 30% stone, 40% swamp, with the remainder couch and slugs I think.
Like you, my clay is still way to wet to dig, which is annoying as I want to dig out a grass path, dig out the couch, and replace with a barky path. The one I did last year worked well. I'm feeling quite happy at having got rid of all that shite, although I am now knackered and ridiculously hungry.
I'm a bit worried that there is still not much green on my newly-planted rasps, and I really hope they've not drowned.