Establish Whether Hyperangulated Videolaryngoscopy (HAVL) Can be Used to Facilitate Tracheal Intubation Effectively and Safely in Unselected Adult Patients; Describe the Population in Whom HAVL Fails to Facilitate Tracheal Intubation Successfully, Identifying Any Contributory Characteristics.

Inclusion criteria

• Adult patients undergoing surgical procedures requiring tracheal intubation as part of their routine anaesthetic care
• Patients undergoing either naso- or oro-tracheal intubation
• Patients undergoing tracheal intubation with or without administration of neuromuscular blocking agents (e.g. those undergoing surgery where facial nerve or recurrent laryngeal nerve monitoring will be utilised)

Exclusion criteria

• Patients <18 years of age
• Patients in whom tracheal intubation is not required as part of their routine anaesthetic care
• Patients in whom tracheal intubation was not planned as part of their routine anaesthetic care, but was required as a rescue technique (e.g. for failed insertion of a supraglottic airway) since appropriate patient consent will not have been obtained · Patients that are physiologically unstable (where clinical care must take priority and/or patient is unable to consent for inclusion in the study)