A wealthy couple harvested sperm from their dead son and used it to create a "designer grandson" in likely the first case of its kind in Britain.

The couple were left devastated after their only child was killed in a motorcycle crash and seemingly ended their chance of becoming grandparents.

But the pair, who are in their 50s, were reportedly desperate for an heir decided to harvest the 26-year-old's sperm, which was frozen and exported to the US, bypassing strict laws in the UK.