Question: When did the land bridge disappear between Britain and the country associated with a harp, as the country where Queen Margaret and her son traveled is associated with a lion?

<P0-S0> The islands enjoy a mild climate and varied soils, giving rise to a diverse pattern of vegetation. <P0-S1> Animal and plant life is similar to that of the northwestern European continent. <P0-S2> There are however, fewer numbers of species, with Ireland having even less. <P0-S3> All native flora and fauna in Ireland is made up of species that migrated from elsewhere in Europe, and Great Britain in particular. <P0-S4> The only window when this could have occurred was between the end of the last Ice Age (about 12,000 years ago) and when the land bridge connecting the two islands was flooded by sea (about 8,000 years ago). <SEP> <P1-S0> the south bank lion, also known as the red lion, is a coade stone sculpture of a standing male lion cast in 1837. it has stood at the east end of westminster bridge in london, to the north side of the bridge beside county hall, since 1966. painted red between 1951 and 1966, the paint was later removed to reveal again the white ceramic surface underneath. <SEP> <P2-S0> samuel adelstein described the lombardi mandolin in 1893 as wider and shorter than the neapolitan mandolin, with a shallower back and a shorter and wider neck, with six single strings to the regular mandolin's set of 4. the lombardi was tuned c, d, a, e, b, g. the strings were fastened to the bridge like a guitar's. <P2-S1> there were 20 frets, covering three octaves, with an additional 5 notes. <P2-S2> when adelstein wrote, there were no nylon strings, and the gut and single strings "do not vibrate so clearly and sweetly as the double steel string of the neapolitan." <SEP> <P3-S0> Queen Margaret and her son had fled to north Wales, parts of which were still in Lancastrian hands. <P3-S1> They later travelled by sea to Scotland to negotiate for Scottish assistance. <P3-S2> Mary of Gueldres, Queen Consort to James II of Scotland, agreed to give Margaret an army on condition that she cede the town of Berwick to Scotland and Mary's daughter be betrothed to Prince Edward. <P3-S3> Margaret agreed, although she had no funds to pay her army and could only promise booty from the riches of southern England, as long as no looting took place north of the River Trent. <SEP> <P4-S0> The Royal coat of arms of the United Kingdom are "Quarterly, I and IV Gules three lions passant guardant in pale Or [for England]; II Or a lion rampant within a double tressure flory-counter-flory Gules [for Scotland]; III Azure a harp Or stringed Argent [for Ireland]". <P4-S1> The supporters are the Lion and the Unicorn; the motto is "Dieu et mon droit" (French: "God and my Right"). <P4-S2> Surrounding the shield is a representation of a Garter bearing the motto of the Chivalric order of the same name; "Honi soit qui mal y pense". <P4-S3> (Old French: "Shame be to him who thinks evil of it"). <P4-S4> In Scotland, the monarch uses an alternative form of the arms in which quarters I and IV represent Scotland, II England, and III Ireland. <P4-S5> The mottoes are "In Defens" (an abbreviated form of the Scots "In My Defens God Me Defend") and the motto of the Order of the Thistle; "Nemo me impune lacessit". <P4-S6> (Latin: "No-one provokes me with impunity"); the supporters are the unicorn and lion, who support both the escutcheon and lances, from which fly the flags of Scotland and England.