Also, available for pre-order from the BFI website https://shop.bfi.org.uk/pre-order-at-last-the-1948-show-3-disc-dvd-set.html#.XNbAdY5Kg2x

According to Amazon, this is being released on 16th September 2019. And is also available for pre-order. https://www.amazon.co.uk/At-Last-1948-Show-DVD/dp/B07RPX615Q/ref=sr_1_1?crid=SQQH0OFLNU5Y&keywords=at+last+the+1948+show+dvd&qid=1557576053&s=gateway&sprefix=At+Last+the+1948+%2Caps%2C218&sr=8-1

According to an article from ATV Today, ( at https://www.atvtoday.co.uk/128202-bfi/):

"This September The British Film Institute will release new definitive editions of two of the most influential comedy sketch shows in TV history...

At Last the 1948 Show launched by Rediffusion London in 1967, for ITV, was produced by David Frost, and written and performed by some of the UK’s best loved comedians: John Cleese, Graham Chapman, Marty Feldman, future ‘Goodie’ Tim Brooke-Taylor, and Aimi MacDonald. The series also transferred to Thames TV when Rediffusion disappeared from London screens in 1968."

"Contents: Includes all the complete surviving episodes from series one and two, plus two reconstructed episodes, for the very first time. Newly recorded interviews with Humphrey Barclay and Tim Brooke-Taylor (2019).  Archive interviews with John Cleese, Marty Feldman, Tim Brooke-Taylor and Aimi MacDonald"