Wee one,
Not at all "temporary".You will be replacing existing LGW L/haul crew who will transfer up the road.If you subsequently want a move or change of fleet..you will have to put your name down on the transfer list,as does everyone else.You'll be at the bottom of it mind,so it will probably be a while.
Used to be "Gatters" L/haul myself..had a great time there,the yearning to see a bit more of the world and the extra cash lured me up to LHR,however.
Enjoy yourself at LGW,they are indeed a great and unique bunch at Gatters...I have many fond memories of my time there.
Good luck on the course.