Adding a disclaimer changes image in email body

Hi all, I am using the following code to add a disclaimer to the bottom of emails.

Public Sub Application_ItemSend(ByVal Item As Object, ByRef Cancel As Boolean)
Dim oMail As Outlook.MailItem

Item.Body = Item.Body & vbCr & _
"Our Company is registered in England and Wales." & vbCr & _
"Registered Office: Baker Street, England"

End Sub

This works fine unless there is an image embedded (not attached) in the email. It either a) turns it into an attachment or b) removes it completely.

Does anyone know why this would be please?

Thanks
John