Thanks - that's really helpful. Yes, I did point out that the UX is going to be a major issue as the users will feel like they are walking on shifting sands... I think we are hoping to push the "What's hot" idea, as you suggest.

Thanks again

We are working on an internal project, where the website owner is thinking of making regular changes to one or two items on the top level menu. Assuming they redirect the original pages or navigate to them in other ways, is there any other impact on SEO to changing the menu structure? I assume they'd submit new sitemaps after each change.

Many thanks

Fiona