On 4 Sep, 20:12, tina wrote:
Hi,
\snip\
Touching one of them it looked soft & mushy.

Problem is likely to be one of air circulation.

Squashes suffer from flower end rotting when water/heavy moisture gets
into the open flowers and doesn't dry out . I grow squashes in a
polytunnel in the far north of Scotland and this is a very common
problem when bad air circulation prevents the young fruits from
staying dry. They turn soft and mushy from the flower end back
towards the stalk and eventually turn into a horrible mush.

Plenty of air circulation can be obtained by careful thinning of the
older leaves, allowing the sun to penetrate the jungle-like
undergrowth that squahes cover themselves with :-)

Hope this helps.

Cheers,
Compo