Section 18

To avoid doubt, where an application (the application in suit) is made for a patent and a declaration is made in accordance with section 17(2) in or in connection with that application specifying an earlier relevant application, the application in suit and any patent granted in pursuance of it are not invalidated by reason only of the relevant intervening acts.

In subsection (1), “relevant intervening acts” means acts done in relation to matter disclosed in an earlier relevant application between the dates of the earlier relevant application and the application in suit, as for example, filing another application for the invention for which the earlier relevant application was made, making information available to the public about that invention or that matter or working that invention, but disregarding any application, or the disclosure to the public of matter contained in any application, which is itself to be disregarded for the purposes of section 17(7).