You are bound to be feeling stressed with all that has happened to you and settling into a new home is always difficult even when things go smoothly.
BT seem to have lost the plot according to anyone I have spoken to who has had dealings with them.
Do you have a local electrical/tv shop who could send out someone to set up your tv etc? It could cost a bit but would be worth it, dealing with all those leads and plugs and finding you just get a fuzz or something won't record is stressful in itself.
Do you have the phone number for the previous owner - if he is still in the district perhaps you could phone him and ask him if he took the meter key with him by mistake?
Perhaps, when you are a bit more organised, you could invite the neighbours, plus a couple of other nice people you have met and your DD for moral support, to come round for a pre-Christmas drink and mince pie, smiling happily through gritted teeth.
At least you will have made an overture.
Royal Mail threatens to stop deliverys over dog attacks


. All little things but combined to making my life difficult. 
and (wine) anyway.

)
'