Enquiry on Validity of ICT - Establised Staff Visa

I am having an ICT Established staff visa stamping valid from 20/10/10 till 23/11/13 (CoS No XXXXXXX), got the visa through VFS Global, Bangalore, India.
I worked in the UK for My Company in UK, Edinburgh, Scotland from 11 November 2010 till 30th Dec 2010, then due to a personal emergency (My father had a critical illness)
I traveled back to India on 30th Dec 2010, then I continued working for My Company in Edinburgh UK for a period of 4.5 months till May 2011 from India (Salary was credited to the UK bank Account).

My Employment with My Company in UK ended on May 2011, From May 2011 till date I am working for My Company in India as a full time employee and I am getting my salary from My Indian Company.

Now My company needs me to travel to UK for about 2 Months, Can I travel to the UK with my existing ICT visa or Do I need to apply for a new Business Visa ?