A JIC is a shortened JOC consisting of 20 hours sim time plus a week in ground school, compared with the same groundschool and 44 hours in the sim for the JOC.
In reality at FTE you will do 16 hours in the sim for MCC anyway (that is included in the JOC time but not the JIC time) so the GB cadets will see 36 hours in the sim in total compared to 44 for Thomson.
Really, 8 hours makes very little difference IMO. Especially when you consider that you don't want to become too type specific on the Hawker 800. It is a tricky wee beastie to fly at the best of times and for people going on to Airbus/73NG type equipment its probably not worth getting too used to the "unique" brand of automatics on that particular sim.
The real benefits of these courses are that they allow you to practice flying as part of a 2 man crew and even more than that, get you fluent in the SOP's of your sponsor company.
V2