Help! New allotment+scottish 'summer'=confused and scared!

Can anyone help? I have been kindly allowed a little space (5ft square-ish) on an allotment near Glasgow. I want to plant something but it keeps raining and raining and it's August! Is there anything I can put in that will grow? The beds are raised and would normally be sunny but aren't right now. I was hoping for salad leaves, some herbs (parsley and coriander top of list), maybe some radishes and beetroot, and some nasturtiums or geraniums for salads. Oh and some spring onions. Am I ever going to be able to do any of this? I've browsed and read and been to the library but I can't find any books on 'salad leaves which love growing in an inch of water'! If those things are impossible, I would love to put something in, to at least try to get going. I know I sound desperate and clueless, and I am, but if anyone can give me a steer it would be great. I don't know anyone with a garden, never mind an allotment!

If you google 'square foot gardening' or search for it on here, you'll see some interesting advice on how to fit maximum stuff into the minimum area.

I've just started off some beetroot in modules for later planting out.  Not too late for most salad leaves, radishes, spring onions, herbs (though I'd do coriander in a pot, to be honest).  It's too late for nasturtiums this year and probably also for geraniums.

PS Welcome to the site.

we done as you have a raised bed flooding will not be a problem , I would however start some things off in pots etc , radish will grow as should turnips and some salad leaves

As The Hitch Hikers Guide say 'Don't Panic". Do not expect everything to work straight away. You could try all the things you mentioned and some in pots. I have some raised beds in my garden as well as an allotment(greedy). Put some salad leaf  in also spring onions. I put some spring onions in last October and they are now the size of proper onions and also very nice in omelettes .