If you search for "would i lie to you" on Shutterstock, you will be met with around 500 images related to said comedy panel show, most of which were taken on set during the fourth and fifth series. Quite a few of these actually depict moments that didn't make the edit of the final programmes. In some cases, the exact context is lost to time.
This particular photo might not seem remarkable at first; it's David Mitchell reading out a story which didn't make the cut. But back in the day there was a very good fan forum, That Mitchell & Webb Fansite, which reported back from each recording from Series 3 up to partway through Series 7 with, among other things, a full list of stories from each show, but not whether they were true or not. Sadly, only the Series 3-4 ones are still online (the forum having closed and gone offline very abruptly), having also been posted, and still preserved, at this LiveJournal community.