Opodo, the online travel agency has said payment processing errors was responsible for overcharging some 1,500 customers earlier this month.

The double, and in some cases, triple overcharging for holiday bookings made during 18 and 19 February was blamed on a technical issue at the third party firm handling Opodo’s transactions.

In a statement, the travel agent apologised to all customers affected and said that “everything was being done to ensure all affected customers are refunded” by 26 February.

A consortium of nine travel firms share ownership in Opodo, including British Airways, Aer Lingus and Air France.