Hope that is of some help. No doubt someone with more comprehensive knowledge on this issue will be along to correct me shortly!!
The RAF web site gives the best breakdown on what the cause of each loss was where known (3 of the aircraft fell in a location where an investigation team could get to them after the ceasefire, so the actual cause of the aircraft loss is known (2 x SAM and 1x Fragged by own bomb detonating on arming). Of the other three including the JP233 aircraft, one was hit by 2 X SA-2 at medium level, while the cause of the other two losses were never determined.
RAF - RAF Tornado Aircraft Losses