The Dandy and the Beano -- Fifty Golden Years was published in 1987 to mark the golden anniversary of the Dandy (its sister publication the Beano having begun just a year later). It was I believe D. C. Thomson's first publication devoted to reprints of classic material from its weekly comics, and a popular one; demand far outstripped supply, necessitating several republications (the book was offered as a competition prize in weekly editions of the Beano and the Dandy for a while afterwards!), and its success led to the creation of the quarterly reprint comics Best of Beezer and Best of Topper the following year, showcasing classics from two titles which got left out of Fifty Golden Years.
In 1996 those two publications were superseded by the monthly Classics From the Comics, which as you can probably guess featured a variety of strips from across most of D. C. Thomson's humour titles (generally mixing big hitters such as Dennis the Menace and Desperate Dan with a rotating selection of more obscure characters). CFtC had an impressive run of nearly a decade and a half, lasting until the end of 2010. The success of Fifty Golden Years also prompted a follow-up book, More From the First 50 Years, in 1989, and that began a tradition that continues to this day: a new hardback book of classic reprints has been published every year.
(I suspect the fact that by the time I started reading comics, there was a 64-page publication of assorted D. C. Thomson archive material available from my newsagent every month, and no equivalent for other companies such as IPC/Fleetway, is a big part of why I've always gravitated towards it more than any other comic publisher... but we can leave the amateur psychoanalysis for another day.)