急!!拿完永居之后申请入籍是哪个表格?费用是多少?

我在HO网上看到好多表格,不确定到底是哪个表格是拿完永居1年之后申请入籍的. 是AN表格吗? 我看这个表格上都没有显示到底申请费用是多少? 哪位高手请指点一下,谢谢!

Naturalisation as a British citizen (form AN)

Single applicant: £655*

Joint application: £735* (husband and wife or civil partners who live together applying at the same time)