British Citizens Non-EU wife with EU/Schengen Residence Permit - How to Visit UK

[BritishExpat]

Hello All
I am a British Citizen working in Czech Republic from 18 months, holding Temporary residence card of CR.
My Indian wife joined me on dependent visa a year ago, she has a Passport like looking visa document saying "Residence Card of a Family Member of a European Union Citizen” which is for 5 years. Don't know whether it is under Article 10 or 20 or totally a different type of residence permit no one on this planet is answering this clearly anyway.
As of now we are just looking to visit the UK as we both are working here, but also thinking to apply for a visa which she is eligible for before the Brexit to be on safe side as my future final destination will be UK.
FYI - I don't have any address in the UK and I will be going just for a visit with my wife initially.
What do you recommend, which visa should I apply for ... appreciate your response.

[CR001]

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[BritishExpat]

Hello
Thanks for the reply
I was unable to login with the old user ID, It just gives me some error message - you are not authorized for a new password.
can you help? Thanks