I wrote to UKBA on the subject under Freedom of Information and blew is text of my request and UKBA reply:
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Dear UK Border Agency,
There appears to be errors in UKBA modernized guideline titled "
Indefinite leave to remain - Calculating continuous stay in UK". The relevant extract is as under:
"Discretion in cases where continuous residence has been broken
Time spent here may exceptionally be aggregated, and continuity not
insisted upon, for cases where:
• There have been no absences abroad, see calculation of the five
year period for settlement, and authorised employment or business
in the UK has not been broken by any interruptions of more than
three months or amounting to more than six months in total for the
whole five year period.
Decisions in such cases must be taken at HEO level or above.
Or
• There have been longer absences abroad, provided the absences
were for compelling grounds either of a compassionate nature or for
reasons related to the applicant’s employment or business in the
UK. No single absence abroad must be for more than three months at
a time and they must not total more than six months.
Where continuous residence has been broken, periods may be
aggregated or shortfalls disregarded only with the approval of an
SEO or Grade 7.â€