You can either open up a bank account with another bank or ask the company/person who sent you the cheques to cancel this one and make out a cheque to another name.
Cash For Cheques in Crawley will cash most business cheques and this can be achieved by Post and Courier Service, usually within 3/4 days. 'Phone them on 01293 415600 during office hours for details. You will need to prove entitlement and prove your ID before this can be done. They are members of the British cheque Cashing Association and are registered with the Government as a Money Service Bureau.