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My experience is with Ask Jeeves US but the concepts are the same.
Basically you are paying to be included into the index (Paid Inclusion) on a per URL basis, for a 12 months subscription period. You will be listed in 4 to 7 days and re-spidered every 7 days or so.
You also get click thru reports and query terms.
With Ask Jeeves, you are not paying per click.
Remember that PFI doesn't boost ranking at all!