It seems that the pricing structure on the A350 has been changed and brought in line with the rest of the fleet. I flew LHR-YYZ on G-XWBE and the pricing was based on time rather than the amount of data used. The full flight for browsing and streaming was £14.99
That's good to hear. Are you able to tell whether internet was slow or fast? I wonder whether they've installed a newer faster infrastructure, or just aligned prices. From memory A350 got factory installed old generation WiFi equipment that worked differently to WiFi installed on A380/B747/B777s.