A notice served by a tenant under this Part is not invalidated by an error in, or omission from, the particulars which are required by regulations under section 176 to be contained in the notice.
Where as a result of such an error or omission—
the parties shall, as soon as practicable after they become aware of the mistake, take all such steps (whether by way of amending, withdrawing or re-serving any notice or extending any period or otherwise) as may be requisite for the propose of securing that all parties are, as nearly as may be, in the same position as they would have been if the mistake had not been made.
The provisions referred to in subsection (2)(b) are—
section 125 (notice of purchase price, etc.),
. . .
section 146 (landlord's notice admitting or denying right to acquire on rent to mortgage terms).
. . .
Subsection (2) does not apply where the tenant has exercised the right to which the notice relates before the parties become aware of the mistake.