Thanks for your comments clipka and Jaime.

I'm using POV-Ray 3.7.0 RC3

I've reduced the pretrace_end from 0.004 to 0.001

This seems to have solved the problem as shown on the updated image.
Thanks!

Here are my amended settings - based on the "Radiosity_Final" settings 
in rad_def.inc

       pretrace_start 0.08
       //pretrace_end   0.004
       pretrace_end   0.001
       count 800
       nearest_count 9
       error_bound 0.2
       recursion_limit 1
       low_error_factor 0.7
       gray_threshold 0
       minimum_reuse 0.01
       brightness 1.0
       adc_bailout 0.01/2


Keep well

Reuben

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