This assumption has proved correct, but only works for those who have the Orange 'Open Access' Pack which gives unlimited WAP access via GPRS (subject to a fair usage policy of 10Mb/month) for £4 a month. In practice, I have used 48MB/month without question.
The Open Access pack also allows unlimited dial-up usage, which again is subject to a fair usage policy and should be useful if GPRS is not working. However I have not checked that this would give free access to the internet via an orangewap access point.
The 'Open Access' pack is no longer available - having been replaced by 'Orange World' which, unfortunately, charges by the MB for both orangewap and orangeinternet access points so you cannot get free internet access with it.
Although I expected to browse the full internet for free on my phone, what has surprised me is that I can use my SPV E200 as a modem to my computer and access the full Internet via the orangewap access point. This gives me unlimited internet access on my desktop PC for just £4/month! In order to do this I had to get the connection settings from a level 3 customer service representative from Orange wirefree enquiry line (dial 156 from your handset). As part of the modem initialisation string I was told to enter 'orangeinterment'. I simply changed this to orangewap and awaited the next bill! Result: All internet access was free!
NOTE: that I am accessing the full internet (not just WAP) and that this post was made for free on my desktop PC and using the Orange SPV E200 as the modem! I also do all my online banking in this way so using a wap access point does not prevent the use of secure protocols.