Medaival people in London, brillant.
Eve

Um... you misspelled Edmund... and then you appeared to call him Edward (unless you were referring to another king called Edward after Edmund, but since you mentioned him in conjunction with the other Pevensies I just assumed you meant Edmund). As for your characters... well... I'll just leave it by saying that Usagi doesn't seem like the most *Narnian* name in the world. And also, half-centaur? I think you're definitely at risk of having your characters turn into Mary Sues already - make sure you flesh them out with believable flaws and personalities. For example, would Usagi have let Arina pull her haphazardly toward the tree, knowing there was obviously something strange about it, considering Usagi is supposed to be her bodyguard? Also, pay attention to the underlying story of the conflict with Calormene. Even the most likable characters don't make up a plot by themselves.

Your writing skills are fairly solid - only a few things here and there I could see. I enjoyed your lack of flowery descriptions and archaic prose which some people use when trying to sound "Tolkienish" or "C.S. Lewisish". Just watch your comma splices and such. :)

Oo what's happening now? Volcano maybe?