Some of the locations are the same for both books, namely, Rhossili, Sennen and Newbury, but there are some new ones as well.
I shall begin with Belgravia, in London, which is where Gideon's father owns a rather nice flat. Abi and Gideon, and later on, Gideon and Charles (bass player with NightHawk), stay there for a while in Rhythm of Deceit. Obviously I've been to London quite a few times, but I haven't ever spent much time in Belgravia, so I can't claim to know it well. I think Roger (Gideon's father), must have bought the flat a long time ago, because looking at the prices of them these days, he'd never be able to afford it. :-)