The Irish Famine of the 1840s to 1852 bought hundreds of thousands of Irish people to England but there always was a steady flow of Irish migrants to England before the famine. Apparently I read that the Irish population of London in 1800 was about 20,000. I have come across many Irish and Scottish sounding surnames in early to mid 1700s in London, Manchester etc as well as French Huguenot in London. Many people migrated to Northern England from Scotland in the 1700s due to tenancy wars etc. I have a Scottish ancestor who moved to England in about 1750-1760. I may have some distant Irish as well.