"The age range of those most affected exactly maps the period after the Wakefield scare, so very many are in the 10-14 age group", said Dr Paul Cosford, medical director, Public Health England.
The museum's collection comprises more than 6, 300 objects including pre-historic tools, Bronze Age, Roman and Saxon artefacts, maps, textiles, books, paintings and prints, together with objects and ephemera from before Victorian times up to World War II, the 1950s and the present day.