Where two people register as civil partners of each other in England and Wales, the civil partnership is void if—
at the time when they do so, they are not eligible to register as civil partners of each other under Chapter 1 (see section 3), or
at the time when they do so they both know—
that due notice of proposed civil partnership has not been given,
that the civil partnership document has not been duly issued,
that the civil partnership document is void under section 17(3) or 27(2) (registration after end of time allowed for registering),
that the place of registration is a place other than that specified in the notices (or notice) of proposed civil partnership and the civil partnership document, . . .
that a civil partnership registrar is not present, or
that the place of registration is on premises that are not approved premises although the registration is purportedly in accordance with section 6(3A)(a), ...
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .