how to position longtables?

[Guy Hindell]

Hi. I’m sure this must be easy, maybe I’m just not looking in the right
places.
 
I have a table which was originally designed using the normal ‘tabular’
environment. It has grown to the point that it won’t fit on a page, so I
switched to ‘longtable’. However, the table is now created in the centre
of the page where previously it appeared against the left margin. How
can I get the longtable to line up with the left margin?
 
guy