hello liuba
if you havent been nationality checking service by your council or register offices,the passaport will be coming back to you until the home office made decision around 3 or 4 months.but if you haven with nationality checking service by your council or register office then they copy your passaports and give you back and they sent for you specila delivery,but you have to pay 40.00 pound for it.
that is what i did anyway.