Is it true that the British and Scottish (and to an extent Irish) are descended in part from the Norse from...?

The most Norse parts are in Scotland,particularly Orkney where it sems the incoming vikings were both male and female. Easterns and parts of northern England have ancestry from both Danes and Norweigians but it's hard to say how much as Danish dna is almost exacly like that of the Anglo-Saxons. Possibly 20%. People of Norman descent (usually titled families) will originally have been of viking ancestry as well. The Norse input in Ireland seems to have been much smaller and rather localised.