Welsh, English, Scottish and Irish are different Nationalities of the United Kingdom. Are their Languages the same?

infact they have very different dialects originated from briton language .they have been invaded from romans and normands so in the past there were many languages.but now  all of them share academic english .All these races melted to form new generation .Irland and Welsh had their own traditions and made wars against England but now they are united 

Welsh is the language of Celtic British branch, and is spoken by some of the people of Wales in the west of Britain

The official language in the United Kingdom in fact is English (British English), the language of West Germanic descended from Old English which features a large number of borrowings from Old Norse, French, Greek and Latin Norman. The spread of English around the world, initially because of the British Empire at a later date, due to the dominance of the United States, and has become the main international language of work, as well as the language most taught second and widespread.

There are four Celtic languages ​​in use in the UK: Welsh, Irish, Scottish Gaelic and Cornish. Is recognized as the first of three regional or minority languages ​​is subject to specific measures for the protection and promotion under the relevant European law, while the recognition of the Corniche but not protected specifically. In the 2001 census, more than a fifth (21%) of the population of Wales said they could occur Welsh increase from the 1991 census