The law states that if you have not been in communication with the creditor for six years or more then court action cannot be taken against you - this is the Statute of Limitations.
This doesn't mean you no longer owe the money, it will still show on your credit history and you can still be asked to pay it.
However, this only applies if you have kept to the terms and conditions of the contract and kept the creditors informed of your new address whenever you move.
As you have failed to do so this debt can still be pursued in the courts and the Limitations Act does not apply.