From the conkers website:
http://www.conkers.co.uk/privacy.aspx
5.1 In the event the Company takes steps to recover any Service Charges and/or Administration Charges due and unpaid by the Client to the Company, the Client shall pay to the Company the Company's costs (including administrative costs) of taking such steps plus VAT on those costs and in addition the Client undertakes that it will at all times be responsible for all costs and expenses incurred by the Company, including but not limited to, Court fees, interest and administrative fees in recovering from the Client any Service Charges due and unpaid from the Client to the Company.
7.3 When an offer for Compensation is obtained from the Third Party on behalf of the Client which in the reasonable opinion of the Company is fair and reasonable and that offer is rejected by the Client then the Company reserves the right to charge a fee equal to the amount of the Service Charge which would have been payable in the event that the Client accepted that offer in line with the Company�s advice.