1987 was another in the string of quiet years for UNIT in the 1980s. The only known incident of a UNIT type had, as far as we can tell, no connection to UNIT or to any of the Doctor Agents.
During 1987, there was a massive exposé of the so-called Zircon Project. This was such a major news story that we do not need to go over the details here. It suffices to say that a vast number of documents were uncovered by BBC Glasgow that suggested that the British Government were covering up contact with Extra-Terrestrial lifeforms. Given UNIT's prominence in alien-related conspiracy theories, it is surprising that there is absolutely no known connection with this incident. However, it is known that MI5 were responsible for removing three vanloads of documents and film from BBC Glasgow.