As far as I am aware, RAF military police do not have constabulary powers over civilians so I would guess that RAF have done investigations involving their personnel and Suffolk Police are dealing with the rest.
However, the Ministry of Defence police could also be involved in this case and, whilst tasked to police MOD personnel and property, I don't know how far reaching their powers are with regards to civilians, whether they could "take over/overrule" Suffolk Constabulary...if that makes sense?
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Just to add to this post, not override it... You can look up RAF police and MOD police on Wikipedia and read what that has to say about the type of work they do or might get called in for. I didn't get the sense from either of those pages that either organisation would have reasonable jurisdiction or much relevance in a case like this, other than offering some of their resources to civilian police, but with civilian police in charge of the investigation.