I've driven Silverstone International in an Evora and it was great fun, challenging in different ways and has a lot of nostalgic feel.
Brands Hatch is also very good and has some fast corners - if they could feature both in the calendar, that would be really good. I don't think you can drop Silverstone for Brands Hatch on track merit alone, personally.
Looks like there's at least two circuits that will join the F1 schedule before Brands Hatch ever returns.