From this month on, people born using a sperm bank in the UK who turn 18 will be able to find out the identity of their biological father because of a landmark change in the law back in 2005, barring anonymous donation. But what of those conceived before the change? This week Barney and award-winning health reporter Jo Macfarlane hear from Dr Joanna Rose who has spent the past 30 years searching for her 'real' dad. Now 51, she reveals that she's finally found him - but, while she is optimistic about finally unlocking the mysteries of her identity, others of her lost generation are consigned to being left in the dark about their origins.

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