Jenny Ryan is best known for her formidable TV performances as the "Bolton Brainiac" on quiz show The Chase - but little did fans know that she has been pursuing another career avenue behind the scenes.The quick-witted star publicised her stand-up comedy debut in aid of Women and Children First on Twitter today, amid talk of the star reviving her halted singing career."Surprise stand-up debut!" she announced to her 109,000 followers.She reposted an advert from the charity explaining how to access the show, titled Cracking Comedy, for 24 hours only on catch-up TV."You have 24 hours to watch #crackingcomedy on @nextupcomedy with #jamesacaster, @MaisieAdam, @sindhuvfunny, @mrmikewozniak, @rocknrolga, @NathanCaton, @elf_lyons, @dnlfoxx and @VixLeyton," the ad read."Plus the stand-up debut of Jenny Ryan, @jenlion from #thechase!"Women And Children First UK describes itself as follows: "Amazing women are being empowered to help others survive and thrive.