This clause sets out a number of offences that, from the commencement date of this provision, will be included in the list of offences eligible for receiving an extended determinate sentence in England and Wales. Adding these offences will ensure that the sentencing regime in England and Wales is consistent in the type of offences it considers serious enough to be eligible for an extended determinate sentence. To make this change, the clause adds the offences specified within the provisions to part 1 of schedule 18 of the sentencing code. These offences all carry a maximum penalty of life, and include the making of explosives, developing biological weapons, endangering the safety of aircraft, using nuclear materials and hijacking or destroying ships. As such, they are of comparable seriousness to other offences already in scope for the extended sentence. Adding these offences to the list will correct the anomaly created by their omission and will ensure that these serious offences and others are eligible for an extended sentence as well.