I was just looking for any tips and pitfalls to avoid in case someone had some useful info.
Thanks anyway...
OK. This is what I'd do:
Forget about what the current residents at the address have, it's irrelevant and more than likely will be ceased when they leave or shortly afterwards (if they have any sense) and guaranteed to complicate your discussions with your providers.
As you want to have line rental and broadband service with different providers, it complicates matters slightly but not excessively.
Contact your chosen line rental provider (Zen) and request a new line at the new address (don't mention anything about the existing service there). Ask for a simultaneous provide code.
Contact your chosen ISP (Freeola) and order a broadband service and supply them the simultaneous provide code.
That's it! Provided that you've given enough notice then both orders should be tied together and provided simultaneously!
Should the move-in date change, I'm lead to believe that if you've ordered a FTTC service then that will be the leading order (Freeola) however if it's ADSL then the line rental order will lead things (Zen) so you'd need to contact the correct provider to rearrange the installation depending upon what broadband service you've chosen.
HTH,
Neil.