I always thought the ending voice said "Mr Blue Sky-iii", but was watching a TOTP2 type program on BBC2 and it's actually "Please turn me over", it's the last song on one side of the vinyl LP
It says ‘please turn me over’ as it was the last song on the album side 1/A and it was added as a bit of a joke to remind the listener to turn the record over.
It's a bit of a dilemma because many people won't know why you are telling them to turn you over while standing on a stage.I do the robot voice on stage and I sing Mr Blue Sky, I've got to look into this now.