Surname change after obtaining ILR

[guptan]

Hi,

Me and my family were granted ILR last year, since my wife's passport was issued before marriage her surname was not changed. But now I applied for new passport as its nearing expiry date. I utilised this opportunity to change her surname, what should I do so that her name can be changed on her resident permit stamping, any help will be highly appreciated.

Regards
N Gupta