When carrying out a Surveillance Radar Approach (SRA), it's normal to use 5 deg heading changes when the approach (a non-precision procedure) terminates at 2nm or less than 5 deg when the approach terminates at less than 2nm.
For an approach using Precision Approach Radar or PAR (which includes an electronic glidepath display), heading changes are usually 2 or 3 deg, however the British Royal Navy often use 1 deg heading changes (or certainly used to).
The problem with modern pilots is they tend to feed heading changes for these types of approach into the autopilot rather than fly them manually; the autopilot however might not recognise a heading change of 5 deg or less, hence it doesn't turn the aircraft until more than 5 deg has been dialled in.
A bizjet pilot (ex military) told me he always teaches his FOs to fly SRA/PAR by flying the appraoch manually and cancelling the yaw damper.