Richard writes:
...my school friend and I spent a long time putting together an adventure game called "Bar Trek", a Star Trek spoof adventure. It was a lot of fun to do, and I still found it funny to play even after 13 years, probably because I still have a childish sense of humour. Writing Bar Trek was the real test case for Adlan, and was the reason why most of the features were developed.
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Looks like this game was released in 1987. Well, it is the year I found on CPC-Power site: https://www.cpc-power.com/index.php?page=detail&num=15214
The ADLAN user manual, which specifically mentions Bar Trek, is dated 1987; so, yes, 1987 definitely seems to be a good place holder date.