Access to the Quick Reference Handbook (QRH) of the Association of Anaesthetists of Great Britain and Ireland (AAGBI) can be found here. This is an excellent guideline for managing various crisis situations in anaesthesia.
Access to the Difficult Airway Society (DAS) guidelines can be found here. These include intubation and extubation guidelines as well as managing difficult airways in specialised areas e.g. paediatrics and obstetrics.
Access to the Resuscitation Council UK 2021 guidelines can be found here.