Please help us build a picture of UK Internet Censorship by adding URLs to be tested, by helping develop new probes (browser extensions, an iPhone client etc etc) or just by spreading the word that https://Blocked.org.uk is available.
Please also see https://www.blocked.org.uk/faq which will explain the level of filtering enabled on some of the probes which will explain why some sites may appear blocked even if you, being on the same ISP, can reach said URL.
Some people have failed to pass the test of "reasonable doubt" for s.53 (3) / (4) defenses e.g. ( http://www.alphr.com/news/361693/teenager-jailed-for-refusin... ) but in other cases they have succeeded (e.g. Lauri Love had his hdd's taken and the NCA couldn't decrypt them but had to release him on bail; http://www.bbc.co.uk/news/uk-england-suffolk-31544346 and subsequently returned some of the storage (before arresting him again))
There are also people out there working to help the reasonable doubt argument; https://brasshorncommunications.uk/projects/s53/