I have made a decision to live dangerously tomorrow. I'm going to plant out my courgettes. I've had cloches over their allocated slots for about 6 weeks, and they've spent a few days outside, but are looking a bit bored in their little pots. 5 day Forecast here on southern edge of Dartmoor is for night temperatures no lower than 10C. Dwarf French beans planted out about a month ago are fine, (though have been under cloches every night, and during the day when it has been unspeakably vile). Broad beans which I sowed direct in Feb ( under cloche cover) have been exposed to the elements for a month, and are just showing flower buds. Might plant out runners and climbing French beans too. Not risking the tomatoes though.