I thought the AAR-VHF aerial mod was because of the inherent yaw and dutch roll and thus necessary not juts because ot the probe but to ensure the probe was going in the same direction as the drogue.
Re the accuracy of the G4B, the Mk 2 Vs had Smiths MFS and the plotter used to monitor the MI with a magnfying glass. Once the HRS was introduced there was a digital readout to 1/10th deg.
(if a spot of cutting & shutting was practicable on such an old design of fuselage,
Don't you remember the Mk 3 was a cut and shut? Same fin just mounted on a new g*d awful empenage.
I suppose with hindsight the whole programme from Comet on was a cut and shut. The trials aircraft as the Comet had the radar but not the bomb bay and so on. Then sticking a searchlight on a fuel tank, a canoe on top of the tail etc etc.