Many thanks for the responses. I am thinking that the limiter must be set in 'limiting' position as the rudder pedals don't want to move that much. The indicator is half way to the out indicator. There are electrical connections and I am tempted to run some 28v to them to see what happens. The rudder bar and pedestal came from different donor Nimrods and have been joined in XV148.
The pedal positions are working correctly through the rudder trim wheel. As the pedals only move at most two inches each way, there is some work to be done to get the right movement.
Thanks again