Europe who saw modern Celtic identity as a threat. In 1998, Dr Simon James of the University of Leicester in the Antiquity article "Celts, politics and motivation in archaeology" replied to Ruth and Vincent Megaw's article questioning the suitability of the term Celtic in the historic sense. The core of his argument was that the Iron Age peoples of Britain should be considered not as generic Celts, but as a mosaic of different societies, each with their own traditions and histories. Later in 1998, this line of reasoning came under criticism, being labelled an intellectual extension of modern British cultural colonialism, as well as for simplifying the anthropological correlation between material culture and ethnicity. Ruth and Vincent Megaw in the Antiquity article "The Mechanism of (Celtic) Dreams?': A Partial Response to Our Critics." attacked 'Celt-sceptics' for being motivated by English nationalism or anxieties about the decline of British imperial power. Simon James, in 1998, wrote a response arguing that the rejection of a Celtic past was not 'nationalist' but partly due to archaeological evidence, and usually by a post-colonial and multi-cultural agenda with recognition that Britain has always been home to multiple identities. Recently the Insular Celts have increasingly been seen as part of an Atlantic trading-networked culture speaking Celtic languages of the Atlantic Bronze Age and probably earlier. In 2003, Professor John Collis of the University of Sheffield wrote a book titled The Celts: Origins, Myths and Invention, itself criticised in 2004 by Ruth and Vincent Megaw in Antiquity. Celtic nations Six nations tend to be most associated with a modern Celtic identity, and are considered the "Celtic nations". Brittany Ireland Scotland Wales Isle of Man Cornwall These six nations alone are considered Celtic by the Celtic League and the Celtic Congress, amongst others. These organisations ascribe to a definition of Celticity-based mainly upon language. Celtic languages have survived (or in some cases been revived) and continue to be used to varying degrees in these six geographical areas. There are also Celtic nomads: Irish Travellers called "Pavee" that speak a language called Shelta that is a creole of Irish Gaelic and other languages, and Indigenous Highland Scottish Travellers called "Tinkers" who speak a language called Beurla Reagaird that is an acrolect of Scottish Gaelic. A number of activists on behalf of other regions/nations have also sought recognition as modern Celts, reflecting the wide diffusion of ancient Celts across Europe.