confirmation from home office

My other half has ILR in the UK and has been living here over 3 years, NOT apply for naturalisation or planing to get British passport. Current passport expiring soon and needs to renew, for that we need to get a letter from home office to confirm that he hasn't applied for UK citizenship.

Has any one applied for it recently or has any idea of how long it'd take to the Home office to reply?

thanks

Here is the instruction from the high commision website

REQUIREMENTS

(i) Duly completed form "O" (IM 37)

(ii) Your current passport

(iii) Proof of present visa status in the UK or Ireland (if not already stamped on the passport)

(iv) If you have 'indefinite leave to remain in the UK'

(a) Which has been issued more than one year ago

&

(b) You have being living in the UK for more than three years;

you are required to submit a letter from the Immigration & Nationality Department in UK, to confirm that you have not acquired or have not applied for UK Citizenship. Forms to be used for this purpose can be downloaded from our web site. This form should be completed and posted or faxed by you to the Immigration & Nationality Department in UK who will in turn send the confirmation to you. This confirmation should be submitted along with your application for a new passport. The letter should have been obtained not later than six months from the date of submitting this application.

here is the detail: New procedure for confirming non-acquisition of British citizenship.

http://www.ukba.homeoffice.gov.uk/sitec ... itizenship

it costs £75.