translate cc (X) (asker) Apr 7, 2014:

Thanks, Guillermo. Yes, that's exactly what I've done: "legal respresentative" and plain old "Mr" for the person concerned.
Cheers,
Andy Birch

Guillermo Urbina Valdés Apr 7, 2014:

Careful! A "representante legal" is usually an attorney but that's not always the case. Make absolutely sure this is actually an attorney before adding "Esq." (also bear in mind that's rather uncommon in UK English) or just omit the "citizen" bit. That's how I deal with both "C." and "Lic."