My favorite adaptation of the books is the old BBC Radio 4 series, which was infinitely better than the 2000s movie and a little more complete than the 1981 BBC 2 TV version, which was also endearing. Although maybe I like the radio shows because they remind me of being little and listening to the box set my dad got as a perk for joining an NPR station.
I have a copy of the old BBC TV Series and have watched it many times before that on our local PBS station. I love it's quirkiness and was actually very disappointed in the big screen adaptation. Nothing will ever replace the book for sheer reading pleasure but the tv version was fun.