Hi Fizzywitch and welcome to the Vine.
Re your courgettes - the fruits are very prone to rotting in damp weather - and it usually starts when the flower gets wet as this then starts to soak the fruit. I remove all the flowers whenever I get a moment, though I still lost some fruits.
Check your plants every second day - you will be amazed you quickly the courgettes grow if you give them 4 or 5 days.
I had a fantastic crop of green courgettes last year, but I had nothing worth harvesting from the yellow variety I grew. They were in the same ground as the green variety and formed loads of fruits but these didn't grow past the size of my pinky finger before they started to rot. C'est la vie - no more yellow courgettes for me.

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Rat

British by birth
Scottish by the Grace of God

[size="1"]Journal updated Tuesday 5th August