A rare format change coming to London's FM dial later this year:
Hits Radio is to replace KISS on FM in London, plus in Norfolk and the West of England later this year.
radiotoday.co.uk
A law was passed just prior to this year's election which will allow for complete format flips on British FM stations. Previously, music formats were regulated, although this had already loosened up somewhat over the past decade. Once the law takes effect later in the year, we'll probably see a few more UK flips, although for the most part the FM dial is dominated by a few operators, who are likely to use this just to tidy up their formats and licenses a bit, as in this case where they're taking the opportunity to put a core brand onto London FM.
Prior to the law change, Kiss 100 was considered to be a "specialist music station" (dance/rhythmic) while Hits is considered "mainstream", although you can't really put much fresh air between Kiss and mainstream CHRs like Capital nowadays. Hits is more of a Hot AC than a CHR, with a lot of recurrents, but even so you'd struggle to listen to a music sequence from Kiss, Capital or Hits and differentiate them without hearing the presentation and imaging.
Of course, this is all happening in the context of a country where all of FM/AM has just a 26% share of listening, the rest being digital, mostly DAB but increasingly online, which stands at 28%, notably 2 points more than FM/AM. The law has been changed on format flips because the format of a single FM license is no longer that important, in a London market which has over 100 DAB stations and spare capacity for many more. DAB formats have never been regulated at all, with a DAB license you can do what you want (within the rules).