Having difficulty connecting to 'The Cloud' public WiFi network (UK) with iPhone 5?

Is anyone else having difficulty connecting to 'The Cloud' public WiFi network in the UK with iPhone 5? (It's the free WiFi network for Caffe Nero, Pizza Express, Phones 4U, and Ambassador Theatre Group amongst others. It's run by BSkyB and is also available to Sky broadband customers)

WiFi works fine everywhere else (so it's not an iOS 6 problem, and I am running 6.0.2) but attempting to connect to "_TheCloud" gets instant 'Unable to connect to network' message. Going to Settings>WiFi>_TheCloud reveals that all the fields (IP Address, Subnet Mask etc) are blank.

It used to work fine on my 3GS, and also works on a colleague's 4S. However both my and my boss's iPhone 5's get the 'Unable to connect..." message.

Anyone know how to solve this problem? Or has anyone else even had this problem? There seems to be little reporting of it online.

I've tried emailing The Cloud, but have yet to receive a response.