This was thrown together in an attempt to save some time having to edit a hefty amount of text content. Simple amend the below script with your table, field, text you want replaced, what you want to replace it with and hey ho - you've hacked your content!
DECLARE @TABLE VARCHAR(30)
DECLARE @FIELD VARCHAR(30)
DECLARE @WHERE VARCHAR(100)
DECLARE @FIND VARCHAR(100)
DECLARE @REPLACEWITH VARCHAR(100)
DECLARE @query VARCHAR(8000)
SET @TABLE = 'MyTableName'
SET @FIELD= 'MyField'
SET @FIND = 'text i want replacing'
SET @REPLACEWITH = 'new text'
BEGIN
SET @query =
'UPDATE ' + @TABLE +
' SET ' + @FIELD +
'= REPLACE(CONVERT(varchar(8000),' +
@FIELD + '),''' + @FIND + ''',''' +
@REPLACEWITH +''')'
EXECUTE (@query) END
GO