Family Visitor visa application

[marrik]

Dear All,

I became citizen couple of weeks ago and have applied for my British PP last week. Due to personal situation, I need to apply family visitor visa for my parents in the next week (planning to do fast track visa). For my passport application, i had submitted all relevant documents i.e. my passport and citizenship ceremony certificate (though i have the certificate number).

If i need to apply for family visitor visa, what document can i submit? With the current delay in passport application due to backlog, it is unlikely to get my documents back before July end.

Really appreciate your inputs on this.

Thanks a lot.