and trust between people in the UK and countries worldwide. It is estimated that 95 per cent of the UK's population are monolingual English speakers. 5.5 per cent of the population are estimated to speak languages brought to the UK as a result of relatively recent immigration. South Asian languages are the largest grouping which includes Punjabi, Urdu, Bengali, Sylheti, Hindi and Gujarati. According to the 2011 census, Polish has become the second-largest language spoken in England and has 546,000 speakers. In 2019, some three quarters of a million people spoke little or no English. Three indigenous Celtic languages are spoken in the UK: Welsh, Irish and Scottish Gaelic. Cornish, which became extinct as a first language in the late 18th century, is subject to revival efforts and has a small group of second language speakers. According to the 2021 census, the Welsh-speaking population of Wales aged three or older was 538,300 people (17.8 per cent). In addition, it is estimated that about 200,000 Welsh speakers live in England. In the 2011 census in Northern Ireland 167,487 people (10.4 per cent) stated that they had "some knowledge of Irish" (see Irish language in Northern Ireland), almost exclusively in the nationalist (mainly Catholic) population. Over 92,000 people in Scotland (just under 2 per cent of the population) had some Gaelic language ability, including 72 per cent of those living in the Outer Hebrides. The number of children being taught either Welsh or Scottish Gaelic is increasing. Among emigrant-descended populations some Scottish Gaelic is still spoken in Canada (principally Nova Scotia and Cape Breton Island), and Welsh in Patagonia, Argentina. Scots, a language descended from early northern Middle English, has limited recognition alongside its regional variant, Ulster Scots in Northern Ireland, without specific commitments to protection and promotion. As of April 2020, there are said to be around 151,000 users of British Sign Language (BSL), a sign language used by deaf people, in the UK. BSL was recognised as a language of England, Scotland and Wales in law in 2022. It is compulsory for pupils to study a second language from the age of seven in England. French and Spanish are the two most commonly taught second languages in the United Kingdom. All pupils in Wales are either taught Welsh as a second language up to age 16, or are taught in Welsh as a first language. Welsh was recognised as having