As a general point re this VAT rounding lark - the VAT rules say that you're allowed to *truncate* fractions of a penny. In other words if the VAT on an item you sell is anywhere between (say) 95.00000001 pence and 95.99999999 pence then the amount you have to send the VAT man is 95p.
*Lots* of accounting packages don't follow this rule though, I regularly had to adjust my invoices when I was a contractor because the agency paid me 1p more than my (truncating) software said was due.