Here are my favourite Steptoe & Son Episodes (in no order):
Anybody agree/disagree?
Divided We Stand
The Desperate Hours
porn Yesterday
Pot Black
Two's Company
Any Old Iron?
Steptoe & Son & Son
Oh What A Beautiful Mourning
Upstairs, Downstairs, Upstairs, Downstairs
Plus I also like the 2 Xmas Specials and the 'Ride Again' Film.