It also predicts that by 2011, online spend will have almost tripled again, to £28.1bn - more than a grand a year per online customer. And the figures don't even include sales of flights, tickets or insurance - all very popular web buys.
Despite these impressive figures, though, there are signs that the market may be maturing. For a start, most big retailers that are going to go online have done so already, and those not involved in virtual commerce now are unlikely to join in any time soon, either because of the cost of entry or because their business models don't work online.
Verdict also predicts that the vast majority of growth will come from existing shoppers spending more rather than from genuinely new customers joining the interweb. And those people with broadband access, it says, are much more likely to shop than those without. Given that only a third of Britain's 30m-odd net users have broadband, it looks as though there really is a digital divide, at least when it comes to doing the shopping.