My suggestion, don’t.
It’s a thankless bloody job, the pay on pallet type work is hopeless and you’ll have some snot nosed desk jockey with a charisma by-pass on the phone chasing you up…this is the norm anyway, of course Gregory’s could be different.
Normally you will get better pay on catering type supply work like Brakes, yes you’ll do some ■■■■■■■ a sack barrow about.