In the UK there is substantial use of secondary legislation. This is where Parliament authorises someone else to make laws on its behalf in some context. These powers delegated by Parliament are usually mundane but can be extreme and there's no limit to what powers Parliament can delegate. Since politicians are lazy they tend to use secondary legislation all the time. This encourages a culture of legislative sloppiness.

While the UK courts have given themselves the power to perform judicial review, there is no constitutional basis for this review and so the courts are reluctant to step on Parliament's toes because if they go too far they risk Parliament deciding that it doesn't like the courts' interference and removing their authority. This isn't a hypothetical and the courts have at times resorted to some crazy mental gymnastics to evade Parliament's attempts to prevent judicial review.

The US has a similar concept that enables federal agencies to make regulations on Congress's behalf but it's much more limited in scope due to the separation of powers and more solid position of the US Supreme Court.