The loads on the Avro were only about 50% between SNN and CDG long before EI came back on the LHR route. As fivejuliet pointed out the loads were excellent (mostly in the high 90's) on the Embraer. In that era the Shannon management always pushed for bigger aircraft on routes rather than frequency. If they had their way they would penalise EI for not having an A380 on the LHR route.