Honeymoon panic, please help!

Hi all, I’m currently anxiously awaiting my passport after applying for a post dated one to travel on my honeymoon in my married name. The wedding is on the 28th May and the honeymoon is on the 31st May. After weeks of chasing the registration service and my GP practice to see how I can get my covid pass changed to my married name immediately after the wedding (as marriages are now posted and not provided on the day). I finally got a sympathetic manager at the registry office who has agreed for me to have an appointment with him on the 30th May to collect marriage certificate in person (allowing my GP to update my details and therefore also my covid pass). I applied for the new passport on the 13th Feb (at which time the average wait was 4-5 weeks). Royal Mail said the documents were received on the 25th Feb, but they didn’t show as revived on the tracker until the 3rd March. It continued to say documents received until the 4th April since which time it has said “being processed”. I have phoned a couple of times to check that all my documents are in order and been told they would have told me within (can’t remember properly, whether she said 2 weeks or 2 days) if there was a problem with my documents. Last time I spoke to them they just said it’s not 10 weeks yet and to just be patient. I am already stressed out to high heavens about the wedding, and do not need to be worrying about getting my passport back in time for the wedding (we’ve gone to a lot of trouble to arrange a week of childcare for us to have this honeymoon and it’s cost a lot more than our usual holidays would). Can someone please reassure me that I will have half a chance of getting this resolved (either because it actually gets to the top of the pile, or by paying to use the new upgrade service [which I would do begrudgingly if it’s after 10 weeks]). This is completely ruining the run up to my wedding 😞. I’ve contacted my MP as well, but not heard back from her as of yet.