Plant ID query - Is it a gourd or a cucumber gone wrong?

Who can identify this plant, it just sprung up in some compost so I don't know exactly what it is. The leaves and flowers are smaller than cucumber plant and the fruit has lots of fine prickles on it. Any suggestions gratefully received....
(When it first germinated I thought it may be a courgette seedling (none previously germinated), so planted outside)
1st image on 28th August 2022.

2nd image 2 weeks later appears to be developing some vertical markings...

What do folks think?
I am not sure its going to make it to maturity but I will cut open before frosts start.
Thanks for your thoughts.
(When it first germinated I thought it may be a courgette seedling (none previously germinated), so planted outside)
1st image on 28th August 2022.

2nd image 2 weeks later appears to be developing some vertical markings...

What do folks think?
I am not sure its going to make it to maturity but I will cut open before frosts start.
Thanks for your thoughts.
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The above fruit (picture in original post) was the only one that has been produced by the plant, while there were plenty of flowers only one got pollinated, which makes me wonder if only one particular insect can pollinate this plant?
Also is appears to be a climbing vine as I pegged the plant to a frame in 3 places.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I will keep folk posted.
It could be a giant version of the wild cucumber I guess
tiny flowers - giant fruit