Thanks for your question.
I regret to say that it is not possible for one person to attend the Registry office on behalf of another in order to obtain a Certificate of No Impediment to Marriage. One would usually make an appointment and take photographic proof of identity (eg. Passport) and address (utility bill or council tax demand/invoice) and then the CNI would be provided
You should though contact the British Embassy or consulate nearest to where you are to marry and ask them to provide you with their details on how to apply for a CNI from abroad. You usually can and they should be able to provide you with the appropriate application forms. You should also check with the Ukrainian authorities whether they accept a CNI obtained in this way, whether they require it to be legalised by the UK Legalisation Office and/or whether they require it to be translated in to the local language by the Institute of Linguists.
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I've never heard of anyone doing that. It would be for the Registry to decide, but I should think there would be issues with your brother being able to certifiy that the copy passport which he would take their would is a genuine copy of yours because, presumably, it is with you. It's just about possible they may accept him attending with a POA and a notarised copy of your passport (which you would have to arrange), but, as I say, it is the registry office's prerogative whether or not to accept this.
I doubt it I'm afraid.
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