By Lars Mucklejohn Lord Alan Sugar has bought back the rights to the name Amstrad, 17 years after selling it to Sky, for a new digital marketing firm led by his grandson. The business magnate and TV personality, best known for BBC One’s The Apprentice, criticised “belligerent” bosses at Sky before it was taken over by Comcast in 2018 for refusing to sell the rights. “I had always asked, since 2007, to have it back because I want to give it down to the family to use in their business,” Lord Sugar told the PA news agency. Lord Sugar founded Amstrad in 1968 at the age of 21. The electronics compa…