To save you costs couldn't your in-laws phone up? While you was at the Home Office they should have handed you a letter confirming that you would be sent an ID card. I have just read the one we received. It says "On receipt of your card you must check it carefully to make sure that all the details on it are corrrect. If you find a mistake, please phone 0300-123 2412 (I think you will need to phone 0044-300-1232412 if you phone from Malaysia) within 10 working days of receiving the card, or you may be charged for a replacement and have to apply again". (The part in italics and bold was also included in the leaflet they sent us) Did you phone that number?
I dont know what they will ask you to do. If it is not staight forward for you, because you are not in UK, it may be best to stick with your NEW surname and amend the Filipno passport again to reflect the double barrel surname? Just a suggestion. I am not an expert on this so do not know what the ramifications may be of doing that. If you decided to take this action you would need to make it clear on ALL your documents of your changed surname, but I guess you will have to do that anyway now that you have your husbands surname. Maybe others on this website may be able to give advice whether my suggestion about you accepting the double barrelled surname would be ok and wise.
