Misc: While sleeping, one man in eight does what?

Questions

Found in the Fens, the Swallowtail is Britains largest native ewhat?

Which american designer set up her own fashion label called DKNY?

Which singer fronted the bands The Specials, Fun Boy Three and The Colour Filed?

In biology which rusiian physiologist was known chiefly for conditioning dogs to salivate upon hearing a bell?

In radio what do the initials CB stand for?