citizenship and ilr

I HAVE APPLIED FOR SET (M) THROUGH THE CHECKING SERVICE BUREAU IN PLYMOUTH AND I HAVE OBTAINED BACK MY NATIONAL PASSPORT
IM WILLING T TRAVEL ABROAD TO MY HOME COUNTRY BEFORE I APPLY FOR THE BRITISH PASSPORT OR ATTEND THE OATH CEREMONY
MY QUESTION IS : WILL MY ILR ID CARD WILL BE STILL VALID TO USE IT WHEN I TRAVEL BACK TO BRITAIN OR IT WILL BE AUTOMATICALLY CANCELLED IN THE MEAN THAT I HAVE OBTAINED THE CITIZENSHIP CERTIFICATE ?
LOOKING TO HEAR FROM YOU SOON

You can travel without a problem.

you need to have held ILR for 12 months before you can apply for BC unless married to a British citizen.