Just out of intrest how do they amend the passport and does the brit visa need to be changed as well?
We were advised it was simpler and cheaper to change the passport in phill before applying for a spouse visa. Which is what we did and meant the wife needed to go to the cfo to get a letter to give to the dfa (or whatever the phill passport office is called) and then once we got the passport back applied for brit visa.
Although it may take your wife a little longer to come over to the UK but may save a small fortune which can be spent on that new brit wardrobe your wife will need once here.