OK, clearly some here not familiar with JFH.
I am not a harrier pilot, so I stand by to be corrected by someone who is,
Corrected as requested.
The Navy struggled to meet the manning component as traditionally on a SHAR Squadron there was a Boss, Senior Pilot and an AWI. In order to follow the RAF Squadron structure they now had to grow two extra Flight Commanders, have 1 - 2 QWIs (which take 2- 3 years to grow) and the obligatory QFI which again took a tour on the Harrier, a tour at Linton/Valley, and then 6 months to a year back on the Harrier before becoming C to I. That was per front line Squadron and then the OCU needed another 2 QWI and QFI. This is where the RN struggled to fill the posts as guess what, they hadn't been flying the GR for a long period of time. The RN focus on trying to make as many QFIs as possible led them to take their eye off the ball in terms of QWIs in my opinion.