I think, but correct me if I'm wrong...
"Right to Abode", generally by birth, should be able to use the "EU" line
"Indefinite leave to remain" should generally use the "All Other Passports" line. However, at certain terminals, there is a special line for permanent residents and visa holders. eg, apparently the special line at LHR T1 has been in operation since last August, although I never noticed it until 2 months ago... Not sure which other terminals or airports have this line, but would love to know... Anyone???