In response to Golf Charlie Charlie
"in the 1980s a new non-scheduled airline was created, also called British Island Airways. It was even floated on the stock exchange as a public company. It operated One-Eleven 500s (I think no other type). However, this company never cut it and collapsed after about 5 or 7 years. Par for the course for UK independents, I guess !"
Peter Villa who had been MD of the old BIA & Air UKs first MD bought the IT charter division of Air UK in 1982 with its 1-11 400s & renamed it BIA with exactly the same colour scheme as its predecessor.
As you rightly say, 1-11 500s followed & then a brief period when they flew MD82s as well.
The airline ceased operations in 1990