I can say without a shadow of a doubt, that there was definitely no Pan American Boeing 707 diversion over the best Christmas Southend ever had. Furthermore, I believe that the KLM Constellation was a 749 and not a 1049.
There was a story that the last diversion of the evening of the 24th was a Viscount 700 of BEA. It was told that it had been trying to divert everywhere and in fact went down to Jersey, which (no surprise) was fogged out and just got into Southend very low on fuel. After all the 'excitment' BEA permantly based a power truck at SEN and possibly a set of steps!