Big Kids is a 13-episode comedy series that premiered on CBBC on BBC One on September 27th, 2000. Noggin signed on to create an US localization. Noggin was only credited in the US edits of the episodes, and the series' copyright belongs solely to the BBC.
Big Kids aired its thirteenth and final episode on December 20th, 2000. It premiered on Noggin in the United States on January 29th, 2001. The series also ran briefly on Nickelodeon from March 9th to March 25th, 2001. The last time it aired on BBC was in 2009.
All that remains of the series is its title card (interestingly in 16:9 - upload.wikimedia.org/wikipedia/en/2/2e/BigKids.png), some pages on BBC's website (which states that the episodes aren't available), and a few clips from Noggin promos from 2001.
Keep in mind that there are two versions of the show: the original UK one and the US localization. I think the US version would be harder to find, as it aired on Noggin's "The Hubbub" block in 2001, which is also mostly lost.
Brian Hilley Might Have An Episode Of The US Version Of Big Kids! Here's The Link: www.youtube.com/watch?v=qe6lw8_KElA He Also Might Have An Episode Of A Walk In Your Shoes!
I Found Some Footage Of The US Version Of Big Kids With A Big Kids Big Marathon That Aired On March 25, 2001! Here's The Link: www.youtube.com/watch?v=EZEwdMLSKBg Enjoy!
Hey nogginoid, Apparently When I Was Watching The Ultimate Noggin Bumper Collection, I Saw A Chat Saying That DJZukin Has Episodes Of The US Version Of Big Kids From Noggin! Here's The Link: www.youtube.com/watch?v=ySBm0S_aKZ4 Now Click Show Chat Replay And Scroll Down Until You See DJZukin's Comments On Big Kids And Ask Him To Upload It To Google Drive! Enjoy And Have Fun!