Two people may register as civil partners of each other under—
the standard procedure;
the procedure for house-bound persons;
the procedure for detained persons;
the special procedure (which is for cases where a person is seriously ill and not expected to recover).
The procedures referred to in subsection (1)(a) to (c) are subject to—
section 20 (modified procedures for certain non-residents);
Schedule 3 (former spouses one of whom has changed sex).
The procedures referred to in subsection (1) (including the procedures as modified by section 20 and Schedule 3) are subject to—
Part 2 of Schedule 1 (provisions applicable in connection with prohibited degrees of relationship), ...
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
This section is also subject to section 249 and Schedule 23 (immigration control and formation of civil partnerships).