Paragraph 6
When it becomes known, or there are reasonable grounds for believing, that—
(a)
in the case of a sealed source, the immediate container or the bonding of the source is broken or damaged;
(b)
any material (whether radioactive or not) forming part of a source has been removed therefrom; or
(c)
any radioactive material has become detached, or has escaped, from a source because of some defect therein,
the Environment Agency must be notified of the occurrence or suspected occurrence as soon as possible, and if the notification is given orally, the notification must be confirmed in writing as soon as is practicable.