If I fix some entries on my Experian credit report, will they be fixed with the other agencies?

I am currently trying to fix a number of entries (incorrect default, linked addresses) on my credit report. I am doing this with Experian. I realise that in the UK we have three credit referencing agencies, if I fix my file with Experian, will I have to do the same with the others or are they all linked so I only need ot do it the once?

Thanks

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