Booked a flight via Opodo for London Gatwick Hong Kong return. Deal accepted, booked and paid for was with China Eastern Airlines via Shanghai. Did not notice before but on return leg a 1 hr transfer between 2 of the Shanghai airports required meaning need to get China Transit visa. Tried to get this sorted out to be transfer in same airport on telephone with Opodo. Agernt originally cooperative then cut me off. Still waiting for someone to respond. Have used many intermediary travel services and Opodo is by far the worst. Merits negative score.