Broke for me on pc. Seems to have broken after the wolf quest with the kids.... Unable to turn in vikings for hire or see the shop/quests.
So if anyone else runs into this - i believe its some kind of ubisoft connection issue. I quit the game - completely quit the uplay app and reopened everything and the quests are back.
I also loaded a save prior to getting to england and when i was able to previously accept the quests at the letter box nothing is there.
Accepted the quests last night, and played a bit today and realized they are missing from my quest log. I also can't reaccept the quests at the letter box. I'm on PC.
So i got to England yesterday and checked my letterbox as a result got the two bonus quests... Today i login to play and the bonus quests are missing from my quest log.