Resolved by Rich!
Hello.
I have 2 motors controlled via a H-bridge so I have a Movement Panel all set up for this. But, I also have a single modified servo I need to control from time to time. Obviously I cannot use another Movement Panel as I already have one, so I have a modified servo control. It works but a cannot reduce the speed, even if I change the min and max values in the config menu.
If there's a way, how can I use the modified servo at a "drastically reduced" maximum speed. Full speed is far to quick and will eventually cause damage (I have already stripped one servo due to this eyeroll). I've had a look through the learn section and script menu but couldn't find any info that would help me with this. Any suggestions would be most welcome and of course appreciated.
Steve. 
Are you doing that in a new project or an existing one? To avoid any conflicting scripts, commands or controls try it in a new project.
Modified servo control will make it move forwards or reverse at full speed (regardless of settings due to the little bug). Modified servo Movement Panel will move forwards or reverse at the specified speeds (this one works OK). Standard Horiz/Vert servo controls will make it move forwards or reverse at varying speeds depending on the position set.
If they are not doing that it's one of two thing;
Yeah did try it in a new empty project. No dice. stress
Well thanks for your help guys. Just to update you, my modified servo burst back in to life again and tried a vertical Movement Panel and it worked, briefly. Then the servo packed up for good, only pulsing any time I hit a control. So ordered and replaced it with a standard servo and all is well.
Thanks again guys.