Season 1 of Britain's Most Evil Killers premiered on 2017-03-02.

Season 2

10

.

2018

.

10 Episodes

Season 2 of Britain's Most Evil Killers premiered on 2018-02-17.

Season 3

10

.

2019

.

10 Episodes

Season 3 of Britain's Most Evil Killers premiered on 2019-10-01.

Season 4

9.9

.

2020

.

10 Episodes

Season 4 of Britain's Most Evil Killers premiered on 2020-03-17.

Season 5

10

.

2020

.

10 Episodes

Season 5 of Britain's Most Evil Killers premiered on 2020-11-10.

Season 6

10

.

2021

.

10 Episodes

Season 6 of Britain's Most Evil Killers premiered on 2021-08-10.

Season 7

10

.

2022

.

10 Episodes

Season 7 of Britain's Most Evil Killers premiered on 2022-09-13.

Season 8

10

.

2023

.

5 Episodes

Season 8 of Britain's Most Evil Killers premiered on 2023-09-14.

Season 9

10

.

2024

.

10 Episodes

Season 9 of Britain's Most Evil Killers premiered on 2024-10-07.

Season 10

10

.

2025

.

5 Episodes

Season 10 of Britain's Most Evil Killers premiered on 2025-10-20.