GPs who work at the Putneymead Group Medical Practice feature in the show and below is a selection of Twitter reactions to the first two episodes from fellow GPs and members of the public alike.
The first series aired last May and followed Dr Chrisanthan Ferdinand and his practice in Lewisham, south east London.
You can comment below to tell us what you thought or on Twitter using the hashtag #GPsBehindClosedDoors. Catch the first two episodes if you missed them on Channel 5's site.
GP and public reaction on Twitter to GPs: Behind Closed Doors
Inspired by #GPsBehindClosedDoors tonight? You should be - GP is an amazing job. Ask your local GP for careers advice. We'd be delighted— DrDean (@DeanEggitt) February 4, 2015
#GPsBehindClosedDoors We're making cuts to GPs? Really? Look how many vulnerable people they're helping!— Liz (@Liz_Bob_Baker) February 4, 2015
#GPsBehindClosedDoors unsung heroes such a wide ranging diverse knowledge x— Ruth slater (@RuthieSlater) February 11, 2015