Tony, thanks for the advice I'll take a look at re-bending the connections. Will have to investigate how to get the control rods out of the fuselage as it's quite tight in there.
The connections were loose from new. Being new I get the impression Z bends will always have a bit of free play in them. This just seems a lot, the rudder for instance can move a fair bit just from the slop in the linkage. However my main concern is that due to this play the rudder & elevator do not self centre, so I'm assuming this surface deflection will cause problems in flight.