TV giants Sky have announced they are overhauling their UK portfolio and will be retiring flagship channel Sky One after nearly 40 years.The shake-up will also include the launch of two new channels, Sky Max and Sky Showcase in its place. Sky Showcase will replace Sky One on the TV listing and will feature a specially curated selection of Sky’s best content from across its portfolio, including Sky Crime, Sky Nature, Sky Arts, Sky Max, Sky Comedy, Sky History, Sky Kids, SyFy and E!.