In reply to Trangia: Trading Standards may well be helpful and offer advice, although I suspect that there isn't a mis-representation here that they would be in a position to take action on. If I were you I would write to the Customer Service Manager for the company and just outline that you have been disappointed with the information provided in their brochure. They might just re-imburse you for the extra you've had to pay.
If you don't get any joy then don't use the same company again, I guess.