好心给个链接吧，老公找半天，头发竖起来了。我来帮他问问万能的苹果。
根据个人具体情况选择查看相关的入籍要求：
http://www.ukba.homeoffice.gov.uk/britishcitizenship/eligibility/naturalisation/
你要找的关键词不是pr或ILR
入籍的要求是：
从他们收到你申请表那天开始算，过去5年内总出境日期不能超450天；五年内最后12个月内单次出境不能超90天；五年内最后12个月内必须持有ILR；
Residential requirements
To demonstrate the residential requirements for naturalisation, you must have:
[ul]
- been resident in the UK for at least five years (this is known as the residential qualifying period); and
- been present in the UK five years before the date of your application; and
- not spent more than 450 days outside the UK during the five-year period; and
- not spent more than 90 days outside the UK in the last 12 months of the five-year period; and
- not been in breach of the Immigration Rules at any stage during the five-year period.
[/ul]
Immigration time restrictions
You must be free from immigration time restrictions when you apply for naturalisation. Unless you are married to or the civil partner of a British citizen, you should have been free from immigration time restrictions during the last 12 months of the residential qualifying period.
红字就是1年的要求。