Eligibility for Basic security clearance for UK job

[Sarva81]

Hi,

i live and work in UK.

i received a Job offer having Joining date of May 9th 2011, but i need to go under basic security clearance i.e resident must lived in Uk for Min 3 yrs.

i started my work in UK(on Work permit) on Oct 2007 and i left UK on Feb 2008 to India for 4 months as i need to set up offshore team.
I returned to UK again on June 2008 [b]on the same VISA[/b] and since then i'm in UK continuing my work.

i'm confused will i qualify for basic security clearance as it says resident must lived in Uk for Min 3 yrs.

If i count from June 2008 to May 2011, i find i just completed 2 Yrs and 11 Months, but if i count frm Oct 2008, i get qualify.

Could you pls clarify will my period in UK count from Oct 2007 or June 2008 for the basic security clearance check.

Thanks in advance
Sarva