By Ali Lyon A boost in occupancy and a hike to rents helped revenue at storage firm Big Yellow to a solid increase in the second quarter. The FTSE 250 constituent, which operates over a hundred storage sites across the UK, generated £50.2m in revenue in the three months to 30 June. Revenue rose a four per cent year on year. Like-for-like store revenue rose three per cent from £47.6m to £49.1m. It was also able to push on rent increases to its customers of four per cent across the year, resulting in a further four per cent achieved in net rent year-on-year. Last week the firm announced it would…