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This gets weirder, though there is probably a simple explanation. I've plugged the aerial directly into the portable and receive all the analogue signals fine. I retuned the proper TV and received some Freeview Channels and not others.
All Analogues are snowy but I'm receiving Freeview Multiplexes Band B and D only. 1,2, A and C are suddenly missing - I haven't touched any of my equipment or moved cables. I just don't know. 
Multiplex 1 includes: BBC1, BBC2, BBC3 
Multiplex 2 includes: ITV1, Channel 4, Channel 5 
Multiplex A includes: ITV3, Channel One, QVC, Top Up TV 
Multiplex B includes: BBC4, Cbeebies, BBC Radio 1 
Multiplex C includes: Sky Three, Dave, Sky News 
Multiplex D includes: Yesterday, Film 4, Viva