Mark and all,
Most of the vehicles entered service on Friday 28th July, according to the Reading Buses website route 702 seems to be known officially as The London Line from this date.
Generic-liveried 731 entered service on Saturday 29th July on route X4. Possibly a precursor of what is to come, as the lion 4/X4 is tipped to receive similar buses in the near future.
Julian Walker