The 1897 marriage has this information as per freebmd for the persons whose marriage was registered in the Lincoln registration district March qtr 1879 under the reference 7a 669. (The 7a relates to the area and the 669 the page number.)
Brown Herbert
Heald Charlotte Annie
Hinch Henrietta
Pask George William
This would indicate that Herbert Brown married either Charlotte Heald or Henrietta Hinch and that George William Pask married the other one. Millie has already confirmed that Herbert married Charlotte at St Swithins so Gge Pask obviously married Henrietta.
In some periods the BMD registers will have up to 8 persons listed under the same page number in the register.

Rosie