8 p
Your own billing, shown in Reply #15 above, says otherwise. 0.008 is 0.8p, not 8p!
korny88 is undoubtedly correct: delivery reports cost 0.8p + 0.2p VAT on Orange contracts, i.e. 1p each.
I would bet that if you count the number of delivery reports that you received, you would find it identical to the number of 0.008 charges shown.
Switch off delivery reports ( this has to be done in all 3 places where they are shown on a Nokia mobile ) and you will find that the charges stop appearing.
BTW if Orange were charging you for texts, the charges would likely show as 0.18 ( i.e. 18p + 2p VAT = 20p each.)