This thread has been split from Utility Warehouse Switch To 0800 From 0844.The changes referred to in the OP are covered in the Utility Warehouse
Frequently Asked Questions under the heading "November Changes".
One question that springs to mind in relation to the new charge for inclusive daytime calls is are you on a legacy package? That is one that is no longer available for new customers and hasn't been so for a while. If you are, then is the £5.50 charge for inclusive daytime calls simply bringing you into line with the current offering?
Irrespective of whether this is the case, £5.50 seems a good price for inclusive daytime calls. I'm not familiar with Utility Warehouse's pricing, but I'll offer conjecture that its free weekday daytime inclusive calls was a loss leader. Comments from someone who knows more will be appreciated.
As for the limit on data download, it only applies where the subscriber is connected to the "extended (BT) network". The limit is 100GB with additional gigabytes, or part thereof, being charged at 25p each.
Where the broadband is provided by Utility Warehouse's LLU partner (which I believe is TalkTalk) then there is no limit. This is obviously governed by TalkTalk having a presence for broadband provision in the subscriber's exchange and it having spare capacity.
LLU means "Local Loop Unbundling", the local loop being the pairs of copper wires that run between subscribers' premises and the local BT exchange building. When there was only BT, all phone lines ran to the local exchange and connected to BT's equipment, which carried calls onwards and into the (BT) network.
Now there are other network providers which are allowed to install their own equipment within BT's exchange buildings, connecting to the local loop, which is operated by BT Openreach. Whilst there are a lot of retail providers out there, there are relatively few network providers (the telcos that run the equipment).
In the case of Utility Warehouse, it purchases (LLU) service from the wholesale arm of TalkTalk. However, TalkTalk doesn't have a presence in every exchange, so where it doesn't Utility Warehouse obtains service from BT Wholesale and it is this service which is subject to the 100GB limit. Thus, "extended (BT) network)" refers to BT Wholesale provision of broadband.
I imagine that the limit could be down to BT Wholesale's charging structure (which I haven't looked into). It stands to reason that Utility Warehouse is only likely to purchase service from BT Wholesale in cases where TalkTalk is unable to supply. Utility Warehouse's retail charge for broadband supplied by BT Wholesale is greater than that supplied by TalkTalk.