I think that you need to have buildings and contents together. Usually you get a discount for it and also if you need to make a claim that combines the two (ie a water leak that damages carpets and ceilings) then if you have them seperate you will have to make two claims and pay two excesses and have double the (inevitable) headache. if you have one company then there'll only be one claim form, one phone call and more importantly one excess.
Also it eliminates any possible grey areas where you phone up to claim for something and they say "oh no thats covered on your buildings".
I have just bought a great joint policy from
Discount Landlord Insuarnce