Yeah - me neither till I saw that.
Yeah, could be Pres B for EEK. I wouldn't have thought it would take 6 weeks to change from one CBBC set to another, though.
Ok, amateur theory time. I think that week (w/c 18th July) was the final "normal" week of afternoons as the schools would have been breaking up at some point during it. (the holiday mornings had started w/c 11th July, presumably for Scotland's benefit). This clip is from the Afternoon on the Moon the day before on 20th July:
And then here's Flipper's last day, which according to Genome would have been the following Sunday 24th July:
This was presumably timed for Josie to be unveiled the following day, Monday 25th July (though she's not in the listings until 8th August). From that Monday, Ratz is credited alongside Toby Anstis on Genome, would would suggest they moved to the roof at that point. As I've put in the comments, there is an argument that that Philippa clip could have been the final appearance of the (BBC1) broom cupboard if we assume that all continuity moved to the roof from the start of the full summer holiday service on 25th July - though the Jarvis clip casts doubt on that theory (as does the power cut delay, which I don't remember myself but have heard elsewhere).