British Museum must be more open in how it deals with controversy, chair tells trustees
Records were altered to conceal alleged thefts over as long as 25 years, chair tells MPs
Movement of objects is normal but documentation work has been 'undermined by structural underfunding'
Institution confirms that it has already retrieved 60 items and identified a further 300
Collections Trust hosts meetings to review core principles related to inventory, audit and loss
Former V&A chief to step in following resignation of Hartwig Fischer
Director says institution is facing situation of the ‘utmost seriousness’ following suspected thefts