Can't get this code to display £ chars

[wossname]

I have a simple text file created with notepad and I am trying to load it into a textbox with this code:

If ofd.ShowDialog = DialogResult.OK Then
            If File.Exists(ofd.FileName) Then
 
                Dim sr As StreamReader = New StreamReader(ofd.FileName)
                Try
                    txtOriginal.Text = sr.ReadToEnd
                Catch ex As Exception
                    MessageBox.Show("Could not load that file: " & ex.Message, "Censor", MessageBoxButtons.OK)
                Finally
                    'tidy up a bit
                    txtOriginal.SelectionLength = 0
                    sr.Close()
                End Try
            End If
        End If

My file has some "£" (British Pounds Sterling symbol, (Shift + 3) on most keyboards.

The whole file loads ok except for the sterling signs. What gives? If I go out of my way to make it work, save the file in unicode, and try again it works OK, but not all of my files will be in unicode).

I'm pretty sure it should show EVERY single printable char in the file (regardless of its encoding), in the textbox, yet this is not the case.