Basically in the UK the only type of marriage that is valid the one that takes place in a registry office (or church). Therefore in addition to having your nikah read you need to have a civil wedding too.
To get married in either of these places you need to contact the some registrar person at your local civic centre to basically apply for permission to marry, both you and you partner have to do this at your respective local civic centres. Once you do this you can set a date for the civil wedding.
The permission you need to get from these people has nothing to do with your nikah.
Hope this makes sense
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