Please see below links 

Zurich - Pressure Systems
Zurich's guide on pressure systems is likely to cover:

Insurance requirements and coverage for pressure systems.

How to assess risk and ensure compliance with safety regulations.

The role of regular inspections and certification in maintaining safe pressure systems.

https://www.zurich.co.uk/engineering/pressure-systems

HSE - Pressure Systems Safety
The HSE (Health and Safety Executive) guide focuses on:

The legal obligations regarding pressure systems under the Pressure Systems Safety Regulations (PSSR).

Safety measures required for pressure systems, including the need for safety devices like relief valves.

How to conduct examinations, including pressure testing and certification.

https://www.hse.gov.uk/pubns/indg261.htm

HSE - Pressure Systems Overview
This page likely gives an overview of what qualifies as a pressure system and why safety is paramount. Key points could include:

Definitions and classifications of pressure systems.

The importance of maintaining systems according to regulatory standards to prevent accidents.

An overview of risk assessment methods and safety protocols.

https://www.hse.gov.uk/pressure-systems/about.htm