Absolutely agree, OP. I've read all three and loved each one.

I tried The Charity Shop Detective Agency by Peter Boland and it was...OK. I've just got the second book in The Marlow Murder Club by Robert Thorogood (of Death in Paradise fame) and I'm looking forward to that.

Eta: Forgot to mention Murder Before Evensong by Reverend Richard Coles. That wasn't too bad for a first try.