Filing country is different and present residence country is diff. please help

[mavericksworld]

Hi,
I have applied from India to New Delhi office. My case has been processed well and so far within processing timeframe. Presently I have been residing in U.K. Two weeks ago I received a letter from New Delhi office to submit Passports within 60 days. My question is .. may I submit my passports to U.K - London office or I must have to send it to New Delhi Office? Please advise/guide what shall I do.   In case if I submit my passport to New Delhi and they need an interview, I need my passports back to travel India from here. What do you think? Similar situation cases please share their experience. Thank you in advance.