Is the top tether still required when using isofix? Yes
Does using Isofix and the vehicle seatbelt at the same time make it safer? No. Only use Isofix OR the vehicle seatbelt (and of course the top tether).
Always read the instruction manual. If you're unsure about anything please book in with your local accredited installer.
Pictured is a Britax Graphene. The same advice applies to other isofix child restraint models including (but not limited to): Britax Millenia, Britax Platinum Pro, britax B-First I-fix, Maxi Cosi Vita Smart, Maxi Cosi Vita Pro, Maxi Cosi Mico Plus, Maxi Cosi Nova LX, Maxi Cosi Moda, Maxi Cosi Mico 6, Maxi Cosi Mico AP, Mother's Choice Adore AP, Mother's Choice Accord, Infasecure Kompressor 4, Infasecure Attain More.
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