Exactly what I was going to say, if that's what JL have surely Very must also have no plus models? I'd never even heard of Very until I read this thread, so I can't believe Apple would allocate them more than JL.
In terms order I would imagine it goes
1. Apple store(s)
2. Primary carriers EE/Vodafone/O2
3. Secondary carriers ID/3/GiffGaff
4. Primary retailers John Lewis/Argos
5. Authorised retailers Solutions/KRCS
6. Secondary retailers Very/Littlewoods etc
Just a guess but that's how I would imagine stock letvels are handed out