(2) Paragraph (1) does not prevent a shadow executive from requesting its shadow authority to  discharge any function specified in a notice given by the shadow executive to the proper officer of  the shadow authority, and the shadow authority must comply with any such request within such  period as the shadow executive may specify.  19. —(1) Notwithstanding section 7(8) and (9) of the 1972 Act (elections of councillors)—  (2) Subject to paragraph (3), nothing in section 89 of the 1972 Act (filling of casual vacancies in  case of councillors) authorises the holding of an election to fill a casual vacancy in the office of  councillor of any of the North Northamptonshire councils or the West Northamptonshire councils  where that vacancy arises after 30th September 2020 and before 1st April 2021.  (3) Where, on the occurrence of a vacancy mentioned in paragraph (2) or in the case of a  number of simultaneous vacancies, the total number of unfilled vacancies in the membership of  one of the North Northamptonshire councils or one of the West Northamptonshire councils (as the  case may be) exceeds one third of the whole number of members of that council an election to fill  the vacancy shall be held in accordance with section 89 of the 1972 Act.  (4) Where, in the circumstances mentioned in paragraph (3), the declaration mentioned in  section 89(1)(a) of the 1972 Act has been made or the notice in writing mentioned in section  89(1)(b) of the 1972 Act has been given within thirty-five days of 1st April 2021 (computed in  accordance with section 243(4) of the 1972 Act) an election shall not be held and any proceedings  required by the Local Elections (Principal Areas) (England and Wales) Rules 2006( b ) shall not be  commenced.  20. —(1) Whole council elections of councillors of North Northamptonshire Council and West  Northamptonshire Council are to be held—  (2) For the purposes of the elections of councillors of North Northamptonshire Council—  ( a ) The Northamptonshire (Changes to Years of Elections) Order 2018 S.I. 2018/1324 changed the year of elections of the  districts within Northamptonshire from 2019 to 2020.  ( b ) S.I. 2006/3304.  11 (b) the names of the new wards are those indicated in column 1 of the table set out in Part 1  of the Schedule to this Order;  (a) North Northamptonshire is to be divided into wards;  (c) every fourth year thereafter.  (b) on the ordinary day of election of councillors in 2025;  (a) on the ordinary day of election of councillors in 2020;  (b) the term of office of councillors serving as councillors of any of those councils ends on  1st April 2021.  (a) ordinary elections are not to be held in 2020 for the return of councillors to any of the  North Northamptonshire councils or the West Northamptonshire councils( a ); and  PART 4  ELECTORAL MATTERS  Cancellation of elections to the North Northamptonshire and West Northamptonshire  Councils  Election of councillors of North Northamptonshire Council and West Northamptonshire  Council in 2020 and subsequent years 