ILR requirement (180 or 450 days)

[rizwan567]

If I can remember the the residence requirement for ILR used to be that in five years of residency on work permit/HSMP/Tier 1 General. Applicant can stay upto 450 days outside the UK and can still get the ILR. However very recently in set(o) form (which is used to apply for ILR) I have noticed this has gone down to as little as 180 days. (which is 6 months or less in 5 years)

The reason I am posting this message is to check from you guys if this is correct. And If this is correct, how come UKBA can change it overnight and apply changes retrospectively.

I can not remember where from I picked this figure of 450 days OR I am wrong, the figure was always 180 days (30 days per year).

Awaiting feedback from you guys to clarify doubts.

[Lucapooka]

450 is the threshold for naturalization. You were looking at the wrong details.

[rizwan567]

Thanks 'Luca' for your reply. Couple of more questions:

When was approximately this requirement of (180 days) first introduced?

And how many days you could be outside UK when ILR was on 4 year basis? was it the same 180 days or it used to be less.

[Lucapooka]

Look at the national archive site