O.K...

New DS811 installed..linked up & "Y" leaded to the other aileron servo in the wing, still a S3010..switch on.[:-].....excellent

..what was 5mm of slop/backlash whatever...is now barely 1mm ...Brilliant ..

...only tinsy winsy thing .....JR's go the opposite direction..

.... now the real downside , i've just found somewhere that sells these DR811's for £29.99...$55 .....blast..!