Like others have said,make sure they (R.P passport and Brit PP) match exactly in your application..
If they dont match there will definitely be issues..
We got refused renewals by HMPO earlier this year because their names in Fil passports were different than the old UK PP`s.

At the end of this thread I mention how our situation was eventually resolved during that worrying time..

http://filipinaroses.com/showthread....ge2?highlight=