The Fluttering by David Whitehead

The Fluttering
by David Whitehead (Ben Bridges)
2008

Brits are attacked by telepathic bats before having their heads beat in by a hammer.  A scientist and cop get to the bottom of things in a clear Guy N. Smith homage.  The kindle title comes up in a search for Smith, meaning he was actually included in the keywords when uploading the file.

Not that there's anything wrong with channeling the master, but it doesn't quite rise to the level of gore or sleaze of the original.

Available for Kindle.