Update 3rd Dec 2021 - The latest 29th Edition of Parent Power 2022 is avaialble at this link

https://kidify.co.uk/blog/2022-the-sunday-times-parent-power-best-schools-in-london-league-tables

2022 The Sunday Times Parent Power League Tables

Best and Top Schools (League Tables)
https://kidify.co.uk/blog/2022-the-sunday-times-parent-power-best-schools-in-london-league-tables

Top Independent / Private Secondary Schools  (Overall)
https://kidify.co.uk/blog/the-sunday-times-parent-power-2022-top-independent-private-secondary-schools

Top Independent / Private Secondary Schools  (London)
https://kidify.co.uk/blog/best-independent-schools-in-london-league-tables-times-parent-power-2022

Top State Secondary Schools Overall)
https://kidify.co.uk/blog/2022-sunday-times-parent-power-top-state-secondary-schools-league-table

As per Sunday Times Parent Power 2021, see below the top independent preparatroy schools league tables for 2021

Top Independent Preparatroy Schools in London and UK - 2021

Guildford High Junior School    Guildford
Alpha Preparatory School    Harrow
St Martin's Preparatory School    Grimsby
Seaton House School    Sutton
Haberdashers' Aske's School for Girls, Junior School    Borehamwood
Ursuline Preparatory School, Warley    Brentwood
Highfield Priory School    Preston
Carleton House Preparatory School    Liverpool
Chigwell Junior School    Chigwell
Notting Hill and Ealing High School Junior School GDST    London
Mayfield Preparatory School    Walsall
St Anne's Preparatory School    Chelmsford
St Mary's Colchester Lower School    Colchester
Benedict House Preparatory School    Sidcup
Royal Grammar School Junior School    Newcastle-upon-Tyne
St Bernard's Preparatory School    Slough
Newbridge Preparatory School    Wolverhampton
Durston House    London
Reddiford School    Pinner
Elm Green Preparatory School    Chelmsford
Windrush Valley School    Chipping Norton
Rydes Hill Preparatory School    Guildford
Date Valley School    Mitcham
Breaside Preparatory School    Bromley
St Peter's School    Kettering
Oakwood School    Purley
Notre Dame Prep School    Norwich
The Belvedere Preparatory School    Liverpool
The Ursuline Preparatory School, Ilford    Ilford
Suffah Primary School    Hounslow
Griffin House Preparatory School    Aylesbury
Park School    Bournemouth
The Shrubbery School    Sutton Coldfield
The Froebelian School    Leeds
Hopelands Preparatory School    Stonehouse
Oliver House School    London
Abbey School    Torquay
Mylnhurst Preparatory School    Sheffield
Buttercup Primary School    London
Merton Court Preparatory School    Sidcup
Lincoln Minster Preparatory School    Lincoln
King's School, Plymouth    Plymouth
New Hall School    Chelmsford
St Andrew's School    Rochester
Widford Lodge Preparatory School    Chelmsford
Dale House School    Batley
St Michael's School    Leigh-on-Sea
Sacred Heart School    Wadhurst
Loyola Preparatory School    Buckhurst Hill
St Winefride's RC Independent School    Shrewsbury
Durlston Court Preparatory School    New Milton
St David's Prep    West Wickham
Crown House Preparatory School    High Wycombe
Huddersfield Grammar Preparatory School    Huddersfield
Waverley Preparatory School    Wokingham
Grange Park Prep School    London
Haddon Dene Preparatory School    Broadstairs
Prenton Preparatory School    Birkenhead
Gateway School    Great Missenden
The King's School, Harpenden    Harpenden
St Peter and St Paul School    Chesterfield
Barlborough Hall School    Chesterfield
Handel House Preparatory School    Gainsborough
Ghyll Royd School and Pre-School    Ilkley
Thorpe Hall School    Southend-on-Sea
Sherrardswood School    Welwyn
Lady Lane Park School    Bingley
Hunter Hall School    Penrith
Read School, Drax    Selby
Argyle House School    Sunderland