In case you’d like a new mystery to watch while hiding from the heat, try Ridley, available on PBS (Sundays at 8pm) and via Passport. Ridley is a retired DI trying to get past a personal tragedy and called back to assist his former sergeant. Thoughtful, observant and quite able to work as a consultant! He also is co-owner of a jazz bar and does sing there at the end of episodes, quite soulfully too. Very good.
And I take back my recommednation of Grantchester. Could not get past the first episoe of the new season on PBS. The holy man shows himself to be self-absorbed and feckless. Not even the ever excellent Robson Green can save this.