Found this info online....
Indefinite Leave to Enter is the permanent residence status in the U.K. awarded by an Embassy or High Commission outside the country. It applies to
• spouses or civil partners after being married for 4 years and having passed the KOL test
• children whose mother or father is settled in the U.K.
• other dependant relatives
• dependants of refugees with indefinate leave
• returning permanent residents who have lost their documents abroad
• settlement after discharge from Gurkhas
• settlement after discharge from HM forces
• spouse and children of ex members of HM forces
If a spouse has been married to a British citizen for more than four years and has not passed the KOL test she will be issued a spouse visa valid for 27 months and endorsed in the remarks column as follows:
SETTLEMENT SPOUSE/CP (KOL REQ)
No recourse to public funds ..