"when did Manx operate the 360? My earliest memories are of G-ISLE at lunchtime"
My earliest records of regular Manx flights go back to 1984 when they were operating night mail flights with the SD3-60. According to Air Britain's "Airlines of the British Isles since 1919" the passenger schedules did not start until 1990, although I believe they actually started in June 1988 using the SD3-60. I first recorded their ATP's in March 1989 and the 146 in April 1990. Weekday flight numbers were JE881/2 and operated late morning, although I seem to recall the weekend flights were later in the day (JE883/4 Sat and JE885/6 Sun from memory).
G-OATP 2/9/89