Drinking at Childwickbury

My father, Dennis Chappin, who was born in 1924, frequently refers to a pub in Childwickbury that he frequented in his youth. He seems to remember leaving Harpenden town centre to have a late drink at this mystery pub as it had later licencing hours. I live at Shafford Cottages, part of the Childwickbury estate, but have yet to come across anyone who knows about this pub. There seems to be no signs of any conversion of a property up on the Green, so I wonder if anyone can recall exactly where this pub was? Further investigation on Google throws up a reference to the 'One Bell Public House on Childwick Green' in the 1906 sales prospectus of the Childwickbury Estate. So, a pub was there in 1906, but no mention of it when the estate was re-sold in 1978. When did it close, and where exactly was it situated on the Green? Can anyone help?