24th June was a Monday, which seems an unlikely day to release hardware on. That was most likely meant as "the week of" as mentioned in the Mega CD post several posts above. This article was also from quite some time after launch, so maybe they didn't have the exact release date beyond the week. This Sega advert from the Daily Mirror seems to put the date at Saturday 29th June, which is a more likely day to release hardware on. It's the only day this ad was run on. In fact, it was the only ad in the paper that Sega ran that year. I think that this makes it the first console to have a promoted UK release date.