This raises an interesting point - An airprox is defined as :
" situation in which, in the opinion of a pilot or a controller, the distance between aircraft as well as their relative positions and speed have been such that the safety of the aircraft involved was or may have been compromised. "
Without giving away Hold27Left's location (it can't be that hard to work out though from his previous posts though
), it appears the UKAB will accept reports from non-controllers who provide an Air Traffic service (See Airprox 165/03 for an example).
Hold27Left's question is therefore valid as guidance on how to file these reports will not have been formally provided, (in the licence syllabus).