Gwapito, if they stay in the UK for 5yrs they can get PR - permanent residency (similar to ILR) and one year later apply for citizenship..
European Economic Area nationals and Swiss nationals
If you are a national of a country in the European Economic Area (EEA) or Switzerland, or you are the family member of such a person, you will automatically have permanent residence status if you have exercised EEA free-movement rights in the UK for a continuous five-year period ending on or after 30 April 2006. You do not need to apply for leave to remain. You should have held permanent residence status for 12 months before you apply for naturalisation.
http://www.ukba.homeoffice.gov.uk/br...drequirements/
In May this year all transitional arrangements (like WRS) for A8-countries will disappear.
and why would he need to keep leaving the uk every 6 months ? ! ?