Stig,
Here are screenshots of the digitised microfilm of the 16 Sqdn ORBs covering the period of this incident, which is what the National Archives at Kew lets you take for free, and should be a reasonable (if fuzzier) facsimile of the original typed documents. I don't reasonably foresee getting access to those. Note the fault with the typewriter where the upper and lower case letters are misaligned with respect to one another. Next we need access to reasonable facsimiles of the two aircrafts' Record Cards for comparison. Are those cards in London? If so, let me know where, as I'm local. Also we need any other (ideally original or good facsimile) documentation which can potentially be used to corroborate one or other document set (or maybe even point out where the discrepancy has crept in):
Cheers
hewasahero