Yes. In both directions, the flight is nonstop.

ITA website manages to make the correct calculation. For example, on the return leg, a departure time of 3.40PM (GMT+0) and arrival time of 7.15PM (GMT+0) makes it a 3 hour 35 minute flight... My five year old niece has recently learnt to tell the time, and she is capable of that calculation. Perhaps BMI should hire her.

London (LHR) to Marrakech (RAK) - XX Oct XX
bmi bmi 447 Dep: 10:05AM Arr: 12:40PM 3h 35m Airbus A320

Marrakech (RAK) to London (LHR) - XX Nov XX
bmi bmi 448 Dep: 3:40PM Arr: 7:15PM 3h 35m Airbus A320