A 1700-ton telco building that was relocated while running in 1950
I'm surprised that they don't move more buildings - I guess it is fabulously expensive.  When I was a child I remember that one local building was moved to allow a road to be widened (<a href="http://www.engineering-timelines.com/scripts/engineeringItem.asp?id=597" rel="nofollow">http://www.engineering-timelines.com/scripts/engineeringItem...</a>).  I've never heard of a UK building being moved since.