Have you also read Garden of the Purple Dragon and Dragon Moon also by Carole Wilkinson?
Here are some other titles I think you may enjoy:
In an interview, Carol Wilkinson said she was reading The Amulet of Samarkand and was enjoying it immensely.
The Amulet of Samarakand by Jonathon Stroud.
Nathaniel, a magician's apprentice, summons up the djinni Bartimaeus and instructs him to steal the Amulet of Samarkand from the powerful magician Simon Lovelace.
Dragon's Keep by Janet Lee Carey.