https://tfl.gov.uk - cant access ssl sites..

Can anyone let me know from an OS 7 device if they can connect to https://tfl.gov.uk - both of my phones on separate networks give the error;

Unable to connect with the current security settings. Please contact your provider...

Other ssl sites (google, facebook etc) all work fine.

Any easy way round this or should I just give up as more & more people are using odd root CA's which may not be known to the hand-held.