DozyWannabe:
There was an audible warning that the aircraft was departing from assigned altitude, but it only went off at the FE's station and unfortunately the FE at the time was in the nose-wheel bay trying to check the indices.
Airlines were able to order some differences on the L-1011, although not like Boeing's era of th 707/727.
EAL and TWA agreed to order the same L-1011 configuration because the plan was for them to use some of ours in the winter and visa versa in the summer. The only difference that I recall from flying the EAL birds on swap (or whatever it was called) was our L-1011 had to radar displays, one on each side of the instrument panel. EAL had only one display in the center. I thought we had a audible alert for inadvertant altitude departure that the pilots could hear, but I never got there.
So, maybe it was just for the F/E.