loaned cash contract

 UK
1.  cash loan signed contract sufficient evident to secure CCJ.
2. 11 year old loan, I sent letters of demand.
Had lost contract due to fires.
Got CCJ 4 yrs ago, as there are 4 contracts for total loan.

3.  % success for late appeal by 4 mths against costs.

4. What are valid grounds to lodge appeal against CCJ decided by trial with all present at trial.

thanks