Attack of the killer cucurbit?

As I've been producing a lot of my own compost, I've had quite a lot spare to use as a mulch and/or a soil additive (which is what, after all, it should be used for!). So I threw a large quantity down where I was going to grow my sweetcorn, and I noticed a large cucurbit seedling coming through: Obviously a seedling that hadn't got killed off in my lukewarm compost heap!

So I let it grow to see what it might turn into. After all, it had to be something I put in there, so was most likely going to be:

• A pumpkin (the one from Halloween)


• A butternut squash (of which we have many)


• A melon (Occasionally)


• A cucumber


• A courgette.

The seedling started off quite large, so I suspect it must most likely be one of the top three. Only now it's starting to outgrow my garden. It's already 7 foot long, and has started climbing up into a Buddleia, which is planted against my fence!

Hopefully someone might be able to identify it from these picture and tell me what I might be expecting to harvest from this (and of course any special growing instructions that go with it)?

Sony Ericsson W810i used for size reference, and Gratuitous photo of veg bed, as it looks so good at the moment :-)