The answer you've been referred to is a little bit off the mark. Unpollinated flowers don't produce fruit - so it's not a pollination problem, as you have developed fruit that have turned yellow & withered.
This is a common problem with plants in the cucurbits family such as courgettes (what you call zuccini in the US), squashes melons, cucumbers etc.
These plants like it warm but can tolerate quite cool temperatures - what they CANNOT tolerate is temperature fluctuations, i.e warm days & cold nights. When exposed to those conditions the fruit will often turn yellow, stop growing and eventually wither and fall off.
Remedy? Keep your plants in as constant a temperature range as possible & water well. DON'T overwater when the plants & fruit turn yellow - thinking they are suffering water shortage. Too much watering can also turn plants yellow (rotted roots and resultant lack of nutrients) and their fruit will wither.
Hope that helps. If you want more info visit my web-sites at http://aberaeronallotments.org
(a gardening social networking site).
Hope you resolve your peoblem soon!