I'm sure it was never that sunny for that long on the coast of Devon, at least not when I've been there, but this is a nicely-directed slice of fun.
It's great not to have a murder every week (though episode 1 was an attempted murder) and opportunistic crimes are more refreshing than pre-planned convoluted "perfect" ones. That said, as with half the Sherlock Holmes mysteries, there isn't necessarily even a crime in this one (okay, hit-and-run maybe, but there are extenuating circumstances.)
The fellow playing Matt/Matty/Matthew did a good job in the final scenes and there was at least one genuine surprise for me, even as a grizzled old detective-show watcher/reader. I'm glad we got some relief from the "Will Humphrey and Martha split up" jeopardy, which could get quite old quite fast.