Postage prices anyone?

Another missive from Royal Mail arrived this morning. Headed "Sharing as much information as soon as we can".
Having read it several times and translated it back into something resembling English it would appear that the prices they sent us last month are final but the exact date they'll start using them is still undecided.  We know what it will cost to send several thousand packets to one post code area and which services will now have VAT added, only one that affects us the big A4 envelopes we sometimes send. But the one thing it doesn't say is how much it will cost to buy a stamp!  All in all we're not really any further forward.