In reply to AllanMac:
Around 15 years ago a company bought the site and wanted to open it as a shooting range (this is from memory, so don't take my recall as 100%) the application went into our firearm licensing department for approval. I wasn't personally involved but it dragged on for years, the company (individual) went bust whilst waiting to open his business and it all moved on. I believe the rules on ranges changed and it was bought by someone else, I don't think as a public range at the time, possibly testing of explosive? Don't know for sure.
One of the legal sticking points was that back in the past it was used for explosives testing and there was still potential unexploded ordnance out there, without the whole area being cleared it could never be passed as "safe" under H&S.
This may or may not have a bearing on what has happened, I have no idea or news for years, but there is a lot of history there and nothing would surprise me!