<p>Unit1 hopes to offer cheaper version of shows such as Abba Voyage, showcasing living and dead artists in any venue</p><p>The former chief executive of Andrew Lloyd Webber’s entertainment group has obtained a near-£15m investment for his UK music tech startup that hopes to recreate classic concerts by manifesting musicians as digital avatars.</p><p>Unit1 was set up last year by Barney Wragg, an entertainment executive who ran Lord Lloyd-Webber’s Cats-to-Evita empire for five years from late 20