Hatfield Villages councillor and London Mayor hopeful Samuel Kasumu has written a book on his time in Government as Boris Johnson's ethnic minority adviser.

Mr Kasumu quit the role in June 2021 over fears the Government were exploiting cultural divisions within society, predicting there would be another incident similar to the murder of MP Jo Cox, just months before Southend West MP Sir David Amess was stabbed to death at a constituency surgery in Leigh-on-Sea.

Now, in his new book, The Power of the Outsider, which went on sale last Thursday, he reflects on his time in Government and "being an outsider" in both life and politics.

Celebrating the book's release, Mr Kasumu - who is considered a Conservative frontrunner for next year's London mayoral election - added: "When I left Downing Street in April 2021, I decided to take myself on this journey of discovery, and really reflect on my experiences in that building, but more importantly to help other people who feel like they are outsiders.

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"I hope this book will change some lives, inspire some people and challenge others."

Political journalist Robert Peston was full of praise for the book, describing it as "important and very moving".

"We spend our lives complaining about how insiders have stitched up everything to their advantage," he said.

"But the biggest winners are often outsiders - who see things others miss and often have superhuman drive.

"Samuel Kasumu has written an important - and very moving - book about the outsider phenomenon."

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Revealing more about The Power of the Outsider, publisher Hodder & Stoughton website reads: "Samuel Kasumu was the most senior black advisor in Boris Johnson’s government, until he left in April 2021.

"Throughout his time in Whitehall, Samuel became increasingly aware that he was an outsider – that his own experiences, assumptions and language were so different to many of those he found himself surrounded by in Downing Street.

"Drawing on his own experiences in government, growing up and beyond, as well as the stories of other outsiders, famous and lesser known, Samuel shows how outsiders are more likely to be trailblazers and break barriers, how they have a greater sense of perspective and progress and how our differences can be a force for good – in politics and beyond."