Limiting post-termination of employment restraints?

In a Court of Appeal judgment dated the 27^th October 2017, in the names of Paul u martu Mariella Mizzi kif ezercenti l-kummerc that l-isem "The Foto Grafer" v David Serracino et, the court considered a clause in a contract which effectively bound an employee to his employer for a period of at least two years of employment, failing which the employee was liable to pay to the employer the sum of Lm10,000. This sum was to be repaid back in view of the investment made by the employer to train the employee for the initial two years and in part as indemnity for breach of contract. The defendant ex-employee appealed the judgment of the first court which had held that the clause was enforceable.