That is a shame as to me the voip part of PN packages is the hidden bonus which should be promoted more. In a world where people are trying to shave a couple of quid off everything the voip package is a winner, for instance adding daytime calls to my BT package would cost me £4.95 on top of my rental so knock that off my Pro package means in affect my BB is a fiver less.
I'm sure theres a lot of people on PN that aren't even aware of the Voip options I know I wasn't for ages then was amazed at its capabilities & benefits.
I know exactly what you mean about 0845/0870 numbers its very annoying, the amount of time I hear local authorities using the excuse that it costs the same as a local call

Surely there not that far away from reality to know that these numbers are not part of anyones landline or mobile package.
My mother (pensioner) paid for her BT package to include peak time calls so imagine trying to explain to her why she's being charged to phone the council offices.
The whole thing stinks off a scam, I think that telephone companies got that cut throat at one point that it became unfeasable to make money and so someone came up with put an 08 instead of a 01 and we'll make money again.
Anyway I digress

I also have a PN business package which again the voip part was the decider as free calls in the day while looking for new customers is worth its weight in gold but to have to swap to my BT line to call for instance any inland revenue numbers is mad, like the man I said if PN was more competetive with their 08 numbers I would just give my money to them.