PaulS,
Apologies for being inept!! I'm new to this so forgot to change the comments after tinkering with the code
I'm powering the servos through the Arduino board (5v) and the board is powered from a bench top power supply
PeterH
Many thanks Peter, I'm trying to get them to both move together, i.e. at the same time but I'm obviously doing something silly. Any pointers would be much appreciated.