What are the books that a resident in Britain can use to teach Arabic language and Islamic religion to children who have no prior knowledge of them?

The importance of learning the Arabic language and its rules is great, but gaining deep understanding in the Islamic religion is better; because of the Prophet's (peace and blessings be upon him) saying: "Whomever Allah wishes good for, He grants him deep understanding in the religion." The first step in seeking knowledge is to purify one's intention for Allah the Almighty, and the second is to fear Allah (taqwa). As for the practical steps, they involve progressing from easy to difficult, from more important to important, and from concise texts to elaborate ones. Seeking knowledge requires patience, the companionship of a teacher, and a diligent friend.