. . . . . and finally . . .  I ended up having three adjacent text 
fields working as if they were a time field as earlier - P1F1 - A2::E,   
P1F2 - A1::N,  P1F3 - A2::E.

This time however no field formulae were used, just range checks:
0 to 23 for P1F1 and 0 to 59 for P1F3

The second remains a no value may be entered field containing the 
initial value ":"

For calculation purposes I currently have a hidden Time field with the 
formula:
convert["T99:99";P1F1 ":" P1F3]

Michael
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