Apologies if these points have been answered many times, but i have become a little confused by the legal situation regarding CNIs, marriage license for marriage in the Philippines.

I intend to obtain a UK CNI from my local registrar. I undertand in takes 21 days to be issued and is valid for 3 months.
Q. Does the 3 months begin on the date of the application or from the date of issue?

Q. When exchanging the UK CNI for the local version at the British Embassy Manila, how long is the local version normally valid for? A further three months or the same period as the UK version?

I ask because there seems to be a 2+ month waiting time for appointments at the embassy at present as well as indeterminate dates for waiting for appointments at my local UK registrar, so advanced planning seems necessary.

Q. Finally, hopefully this isn't a big issue, but how long is the validity of the marriage license in the Philippines before the intended data of marriage?

Thanks