Buffy is in England to get over Angel. Finds Williams diary and they begin to meet in her dreams

Add to that -- William runs into a woman (maybe on a bench somewhere) who is later revealed to be a witch. I believe she gives him a tea that he drinks before bed and he ends up in the dream with Buffy. They end up romancing each other. And at the end when reality comes back into play, Buffy realizes William is Spike but doesn't think she can be with him. There is a sequel in which Buffy is pregnant from her time with William. The witch, who was bound, tries to use Willow to get her powers back. And there is a girl who Zander ends up with who is some sort of warrior -- she has all kinds of piercings.

I thought I read them on Nocturnal Light but I went through all the fics there and didn't see them

I'm pretty sure you're talking about Legions of True Hearts by Eurydice
"Post graduation, a restless Buffy goes to London to escape the memories of Angel, only to lose herself in unexpected dreams. But is William real, or is he a distraction? Is he, possibly...both? Buffy/William. - Complete." It can be found here: http://dark-solace.org/elysian/viewstory.php?sid=431

The sequel A Symphony of Echoes can also be found at EF.

Yes! Thank you so much!