add right colum to twnety twelve article page like home page

Hello all

I have a question regarding the twenty eleven theme

Here is my blog: http://www.twinkleclean.co.uk/blog/

I want to replicate the homepage style layout when a user clicks on the actual blog article title and is sent to the blog page for example: http://www.twinkleclean.co.uk/blog/2012/04/end-of-tenancy-cleaning-can-actually-save-you-money/

Once they click through they lose the right column… is this a default thing with this theme?