The chief executive said masks are expected to be become the new 'must-have accessory' as the world emerges from lockdown.
The Prince of Wales has been photographed giving Prince Louis a hug.
The duke and duchess have not been seen side-by-side in the UK since early January.
Public Health England has confirmed the presence of the tick-borne encephalitis virus in Norfolk and on the Hampshire-Dorset border.
Nelson and Eddy are now nine years old.