Thanks for the reply.
I would like to know what is the exact meaning of curtailed . tried to search it on net but could not get the right answer . Appreciate if you can elaborate.

I was issued cos in Aug 2011. and it is going to end on 28 aug 2012 and the visa is valid till 5 sep 2012.
I was not able to travel due to some reasons.
Now i have to travel to uk for 2 months. This is my first visit to UK
Is it possible to travel now.
Appreciate your help.