Our nop 1.9 site is linked with an in store stock program and as such we cannot have prices display without tax (VAT) included). I've set up the site for ex-VAT countries to place order ex-VAT - however when they checkout tax is displayed as £0.00 however the VAT has not been deducted (i.e. the subtotal - the price including VAT) is not decreased by the VAT amount.
Obviously this requires custom coding, however I'm wondering if anyone has done this before and if so, could give me some tips.