Motor is not rotating when operated via bluetooth

[TomGeorge]

 pinMode(2, OUTPUT);  //Left motors forward
  pinMode(3, OUTPUT);  //Left motors reverse
  pinMode(4, OUTPUT);  //Right motors forward
  pinMode(5, OUTPUT);  //Right motors reverse

It would be better to give your pins variable names

 byte LeftFwdPin = 2;
 byte LeftRevPin = 3;
 byte RightFwdPin = 4;
 byte RightRevPin = 5;


  pinMode(LeftFwdPin, OUTPUT);  //Left motors forward
  pinMode(LeftRevPin, OUTPUT);  //Left motors reverse
  pinMode(RightFwdPin, OUTPUT);  //Right motors forward
  pinMode(RightRevPin, OUTPUT);  //Right motors reverse

Tom...