Is Kate Middleton from English ancestry or more Welsh, Scottish or Irish ancestry?

Middleton is a locational Anglo-Saxon surname originating from dozens of different settlements in England going by one of the pre-7th century Old English variations of "middle" (such as midel) and "town" (such as tun). The earliest recorded examples of such hamlets date to 1086 and include Middeltone, Mideltuna, and Middeltune in such Derbyshire, Shropshire, Sussex, and Yorkshire. The surname "Mideltone" is recorded in Oxfordshire (1166), "Midilton" is noted in Arbroath, Scotland (1221) and "Middelton" is found in Yorkshire (1273)