According to 'British Secret Projects: Hypersonics, Ramjets and Missiles'
'Back in 1966 Hawker Siddeley Dynamics had proposed the Cluster Martel. This mated the AJ.168 TV Martel airframe with many of the components of Hunting's BL.755. To allow ejection of the bomblets at the appropriate altitude, the radar fuse from the WE.177 nuclear bomb was to be used. However, the Air Staff considered this a complete waste of time and effort for what was basically a powered cluster bomb and so BL.755 entered service as a free fall bomb'
The Skomer website lists a range of 37.3 miles for the Cluster Martel.
If this had been proceeded with, any guestimates as to how accurate that could have been given no GPS although if you are using the TV versions airframe presumably you could be quite accurate as long as the weather is not too bad?