At the moment, a vast amount of shows are listed as 'existence unknown' on lostshows.com. This does not necessarily mean that they all are lost. This is just what the search engine says while entries are being updated (it takes ages to do this and I do not envy the compilers!!!!)
In the meanwhile, while its' fate is unknown, there is one dated full episode of the Big Breakfast on youtube (lots of clips, but only one full episode).
Is there any way to get hold of any of the old Big Breakfast episodes that do exist? I'd really love to watch some of the old Chris Evens-era episodes, but it's hard to find anything on YouTube. I found a "Best of the Big Breakfast VHS" video there and it brought back some great nostalgic memories, but it would be really good to see some full old episodes.