Travel to the United Kingdom visa free for non-EU family member of EU Citizen

I am citizen of Uzbekistan, and I am living in Czech Republik 7 years, I do hold a permanent Resident card - Family member of EU Citizen. Me, my boyfriend (he is Czech citizen) and our son (Czech citizen) would like to travel together for 5 days to United Kingdom (London).
Do I need a visa before travel?
I did find information on Internet that:
The UK cannot block family members who are originally from outside Europe but now live in the EU entering the country without a visa, European judges say.
Non-EU family members do not need visa to enter UK, says European court Judges’ decision in McCarthy case is another setback in campaign by British government to control immigration from EU.
Best Answer
UPDATE: The UK has updated its rules and it should now be possible to enter the country without visa with your “Family member of EU citizen” residence card. See EU rights clinic for more details.
What you read seems correct but this new McCarthy decision dates from mid-December 2014, a bit more than a month ago and this is only one step in a procedure. The UK court that requested a preliminary ruling from the EUCJ should then draw the relevant conclusion for Mr. McCarthy's case. The next logical step would be for the UK to amend their rules and issue instructions to the relevant agencies/departments to bring their practice in line with the decision.
I am not sure whether they already did it or if and when they will do it. Until all this settles down, it's difficult to know what the exact rules will be and it's still possible that an airline would deny boarding and/or a border guard would deny entry to EU citizens' relatives without visas even if this requirement is now apparently in breach of EU law.
It would therefore seem more prudent to apply for a visa even though it should in principle not be necessary.
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Can EU family member travel to UK without visa?
EU , EEA and Swiss citizens can travel to the UK for holidays or short trips without needing a visa. In other cases, find out if you need to apply for a visa to enter the UK . You can cross the UK border using a valid passport which should be valid for the whole time you are in the UK .Can I bring my EU citizen family to the UK?
Any EU citizen taking up residence in the UK in accordance with the EU regulations can bring their family with. The EEA family permit or visa is valid for six months. The permit allows the holder to enter and leave the UK as many times as he/she needs to. The Family Permit's holder can take up employment in the UK.Does a spouse of an EU citizen need a visa?
If you are travelling to the Schengen area as the spouse of an E.U. citizen, you should apply for the European Spouse Schengen Visa.How do you invite a family member to the UK?
Letter inviting your family member to come to the UKHow can non-EU Citizen family members of EU Citizens with Settled Status travel to the UK?
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Answer 2
You are completely right that the courts have ruled the UK visa policy to be a violation of the relevant EU regulations. That won't however help you from being rejected at the border, if the entry clearance officer guidelines haven't been modified yet.
If you are travelling together with your family members, you do however not need a regular visitor visa. You can apply for an EEA Family Permit, which will be issued by any UK visa issuing post (most consulates and embassies) free of charge. According to the UK Visas and Immigration guidelines, the permit should whereever possible be issued immediately:
Wherever possible a decision should be made at the time it is lodged or after an interview is conducted.
An issue may of course be that if you are not married to your partner (you talk about your boy-friend), you are not considered to be a "core family member" of an EEA citizen. Having had a Czech resident card for family members for seven years should however be enough to convince the UK officals that you live in a "durable relationship" with the EEA national. A marriage is not strictly required to be considered as a family member.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Ethan Wilkinson, RODNAE Productions, RODNAE Productions, Jan Kopřiva