A declaration by F6the appropriate conservation body that any land is the subject of F5a nature reserve agreement or an agreement under section 16, or has been acquired and is held by F6the appropriate conservation body, shall be sufficient evidence, unless the contrary is proved, that the land is subject to such an agreement or has been so acquired and is so held, as the case may be.

A declaration by F2the appropriate conservation body that any land which is subject to such an agreement as aforesaid, or is held by F2the appropriate conservation body is being managed as a nature reserve shall be conclusive of the matters declared.

It shall be the duty of F1the appropriate conservation body, where any such declaration has been made and the agreement to which it relates ceases to be in force, or the land to which it relates ceases to be held by the F1the appropriate conservation body or to be managed as a nature reserve, as the case may be, to make a declaration of that fact; and any such declaration shall be conclusive of the matters declared.

F3the appropriate conservation body shall publish notice of any declaration under this section in such manner as appears to them best suited for informing persons concerned.

A document purporting to be certified on behalf of F4the appropriate conservation body to be a true copy of any declaration under this section shall be receivable in evidence and shall be deemed, unless the contrary is shown, to be such a copy.