Nick wrote
Bob Hobden wrote:

My courgette is a disaster, YET AGAIN. I have avoided mosaic virus,
but it has something that causes blossom end rot before it is big
enough to make even a nibble. I think that I shall give up, as
with potatoes :-(

Sounds like lack of pollination.

Does that cause blossom end rot?

It causes the embryonic fruit to not grow much and rot, which IME it does
from the blossom end.

--
Regards
Bob Hobden
W.of London. UK