Hi and welcome .
i dont think there is a porch that fits it properly.
Theres a pic of one in the tent reviews at the top of the page, with a vango standard canopy attached. Not a great fit, but looks like it would keep the rain off the front door.
the standard canopies are about £25 new on ebay .
We had the same problem trying to get a porch for our Curlew 6 till some one recommended a Colman Classic awning, they’d used on a old dome and their replacement tunnel, neither of them Colman tents (sorry I don't know what type or make) and they said its great even cooking in it (I know we are not to cook in them). So we've just got one from Argos for £19.99 with £10 off (see link below)