Active equity funds on sale to UK investors posted their worst month for net sales in a year during September, ending a two-year winning streak that saw them outpace cheaper passive rivals.

Outflows of £1.3bn last month were posted by active equity funds, with those focused on the UK, North America and Europe among those worst hit, according to data from Calastone, which tracks money entering and leaving funds in the UK from financial advisers, fund supermarkets and wealth managers.