Succinctly put and spot on Cees.

… For instance the RAF Museum has a good quality original nose transparency in storage as well as an original undercarriage leg. …

Have you seen the u/c leg in store? It could be one of those from RG475, in which case it will be a little moth eaten. In the late 70s one of RG475’s u/c legs and two tyres and hubs (not from that aircraft) were donated to Hendon. Half of the other RG475 leg is on display at the Walton Heritage Museum.

Certainly looks like it. The bottom part of the explosion looks very convincing but the top half looks a bit odd. Maybe it’s just a poor reproduction: modern scan of a xerox copied newspaper picture? The explosion was proably just the ordnance. Note the cut marks on the wing ribs in the colour photo in post #15 (to remove the guns and ammunition?) and the lack of blast damage on those items. The large lump of frame to the left, not present in the b&w photo in post #15, must have been the scrap men’s haul. Such a pity.

I think it is just ‘bits’. The pieces in the first photo below were loaned to the embryo museum at Andrewsfield, later to become the Rebel Air Museum. Maybe they survived Rebel’s closure and someone may know where they are now? I’ve often wondered about the remains of yellow paint on some of those panels. As far as I know no pieces went to the East Essex Aviation Museum at Point Clear which wasn’t formed until 14 years after the recovery.
The Sabre engine was brought up with the wreckage. After the police had removed the ordnance I understood the remains were salvaged for scrap by the local marine community. The engine might have survived, but I have no idea what happened to it.
It is very unlikely that the wreckage was blown up by the Army/Navy. There would be no point. It lay well above low water mark and would just spread jagged metal over a wide area. The second photo shows the site in 1972, marked by two staves, cleared of all large metal bits and no sign of a crater in the mud. The larger pieces are the fuel tanks.
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A soaking in DeoxC (by Bilthamber). Google will lead you to it.

Probably one of the series of official photos taken in late September 40 (21st?) when 616 flew down to Fowlmere to join 19 Sqdn. Others in the series include a mixed group of 19 & 616 Sqdn pilots standing by / sitting on a Spitfire wing and the much used photo of 19 Sqdn’s Sgt Jennings taking off in QV-I X4474.