Al Gore, the former US vice-president turned environmental evangelist, has taken a stake in Ocado’s latest fundraising as the retailer gears up for a possible flotation.

Alongside the almost 1 per cent stake taken by Mr Gore’s Generation Investment Management, Fidelity International, one of the biggest UK investment groups, has also taken an up to 2 per cent stake as part of a £50m ($83m) fundraising by Ocado.