I wonder why there is an end date on the ILR visa in my passport then. It gives the impression that something must be renewed.
It may be that they are required to put an expiry date on it because they cannot issue the visa without one - and it would normally be the same as the passport expiry date (this was the case for ILE anyway, not sure about ILR issued in the UK - perhaps they did things a bit differently when they were issuing ILR back in 2003).
However, ILR is indefinite and never expires - the only way you can lose it is if you move away from the UK and do not return to live here within 2 years, or if you are stripped of it due to committing a serious offence or terrorism or something.
I can't find anything specifically about ILR visa expiry dates, but from the guidance on Entry Clearance vignettes on the UKBA website, the guidance for ILE (issued outside the UK before the rules changed) is as follows (
http://www.ukba.homeoffice.gov.uk/policyandlaw/guidance/ecg/ecb/ecb9/#header8):
ECB9.6 Indefinite Leave to Enter (ILE) and Indefinite Leave to Remain (ILR)
Applicants who are granted Indefinite Leave to Enter (ILE) at a visa issuing Post should have no time restrictions on their stay in the UK, that is, they can stay indefinitely. ILE carries the same entitlement as 'Indefinite Leave to Remain' (ILR) which is issued by the UK Border Agency to those who have already travelled to the UK. Anyone who has ILE does not have to apply for ILR when in the UK.
Although indefinite leave, by definition, will not expire, the ECO is unable to issue a visa to those who meet the criteria for ILE without putting a 'validity date' on the visa. In cases of ILE the 'validity date' on the visa should match the expiry date on the passport. When the applicant gets a new passport, they can apply to UK Border Agency for a transfer of conditions into their new passport. They do not need to apply for Indefinite Leave to Remain (ILR).
My lawyer explained it to me, and it was something like this -
Biometric Residence Permit for those with ILR will expire either after 5 years or 10 years (more normal). If you are still on ILR (e.g. you haven't been naturalised), then you must get it renewed. This is in line with requirements for UK passport and driving licence photocard.
New photo. That sort of thing. Not a new ILR application with approval needed.
While that is true for BRPs because they are only valid for 10 years, it is irrelevant to caligirl's question because her ILR was issued in 2003, several years before BRPs were introduced, and so her visa is a sticker in her passport... and it is indefinite, so there is no need to renew anything at all.