I'm pretty sure the announcer is the same one that fronted The Core. I remember this incarnation but I also remember The Core having a logo.
Yep it was Kate McIntyre that hosted the slot. At first it ran for 90 minutes (approx) on Saturday morning and then for 2 1/2 - 3 hours in the afternoon airing either side of the sunset beach omnibus. Soon after becoming the core the omnibus was dropped and the slot was extended. The slot also aired on Sunday mornings and picked up a lot of the home grown programmes that had previously aired within the mag (the mag subsequently spun into its own 30 minute debate and discussion programme that aired in the Sunday unnamed slot).
With no name, the slot used
kate@channel5.co.uk for the email address but oddly Channel5.co.uk/sadie/ for a website address. The core was a lovely way to fill the weekend slots with teenage/young adult programming with cheap continuity, unfortunately it ended soon after they revamped in the autumn of 2001 to a dual presenter format in a slightly bigger (but still tiny) studio.
I totally agree about the initial branding, I'd argue that idents and surrounding presentation are still the strongest that the channel has had. The idents were incredibly varied for daytime, entertainment, films, drama, etc. Something that the current set lacks in my opinion, and they not only featured the logo and different text variants of 'five' but the vocal representation within the ident audio, something that I hadn't heard before but it worked well to reaffirm the brand.