Thanks Marian and Marian for the explanation of Warner holidays and Wembley.
The Warner properties do look very nice on its website. We don't have a chain like that in the US; we have individual B&Bs but I don't care for that concept. It sounds like I can't really stay at a Warner property for an evening, or two, but need to purchase a package.
I think I'll stay away from the Wembley area for awhile ... sounds too congested and uncomfortable.
Perhaps Royal Festival Hall looks better inside than outside. I didn't find the exterior to be attractive. The last time I was in that area, there was so much construction.