Question: When did this United Kingdom language develop as a distinct language spoken in the northern third of the island of Great Britain ?

text: Languages of the United Kingdom
List of languages and dialects -- Living
The table below outlines living indigenous languages of the United Kingdom ( England , Wales , Scotland and Northern Ireland ) . The languages of the Crown Dependencies ( the Channel Islands and the Isle of Man ) are not included here .
English, in various dialects, is the most widely spoken language of the United Kingdom, however there are a number of regional languages also spoken. There are 14 indigenous languages used across the British Isles: 5 Celtic, 3 Germanic, 3 Romance, and 3 sign languages. There are also many immigrant languages spoken in the British Isles, mainly within inner city areas; these languages are mainly from South Asia and Eastern Europe. The de facto official language of the United Kingdom is English, which is spoken by approximately 59.8 million residents, or 98% of the population, over the age of three. (According to 2011 census data, 864,000 people in England and Wales reported speaking little or no English.) An estimated 700,000 people speak Welsh in the UK, an official language in Wales and the only de jure official language in any part of the UK. Approximately 1.5 million people in the UK speak Scots - although there is debate as to whether this is a distinct language, or a variety of English.
Language Type Spoken in No . of speakers in the UK
English Germanic ( West Germanic ) Throughout the United Kingdom 59,824,194 ; 98% ( 2011 census )
Scots ( Ulster Scots in Northern Ireland ) Germanic ( West Germanic ) Scotland ( Scottish Lowlands , Caithness , Northern Isles ) Northern Ireland ( counties Down , Antrim , Londonderry ) , Berwick-on-Tweed 2.6% ( 2011 census ) Scotland : 1,541,693 ; 30% Northern Ireland : 34,439 ; 2% ( although 8.1% with some ability )
Welsh Celtic ( Brythonic ) Wales ( especially west and north ) and parts of England near the Welsh-English border ; Welsh communities in major English cities such as London , Birmingham , Manchester and Liverpool 1,123,500 ; 1.7% ( 2019 Wales figures , with England , Scotland and Northen Ireland esitmated figures from 2011 census ) Wales : 874,600 ; 29% ( 2019 ) All skills ( speaking , reading , or writing ) : 1,012,500 England : 110,000 ( estimated speakers in 2001 ) 8,200 first language speakers ( 2011 census ) Scotland and Northern Ireland : 1,000 ( estimated speakers in 2001 )
British Sign Language BANZSL Throughout the United Kingdom 125,000 ( 2010 data )
Irish Celtic ( Goidelic ) Northern Ireland , with communities in Glasgow , Liverpool , Manchester , London etc 95,000 ( 2004 data )
Angloromani Mixed Spoken by English Romanichal Traveller communities in England , Scotland and Wales 90,000 ( 1990 data )
Scottish Gaelic Celtic ( Goidelic ) Scotland ( Scottish Highlands and Hebrides with substantial minorities in various Scottish cities ; a small community in London ) 65,674 total , ( Scotland 's 2001 Census ) though those who have fluency in all three skills is 32,400
Cornish Celtic ( Brythonic ) Cornwall ( small minorities of speakers in Plymouth , London , and South Wales ) 557 ( 2011 data )
Shelta Mixed Spoken by Irish Traveller communities throughout the United Kingdom Est . 30,000 in UK . Fewer than 86,000 worldwide
Irish Sign Language Francosign Northern Ireland Unknown
Northern Ireland Sign Language BANZSL Northern Ireland Unknown