"Hi, XXX, your YYY's licence (rego) will expire on 15 August. RENEW ON TIME TO AVOID A FINE"
You know, I'd feel much more positive about the whole thing if it said "RENEW ON TIME TO GO INTO A MONTHLY DRAW FOR SOME NICE BIT OF TECH YOU'VE ALWAYS WANTED"
Or even "TO WIN BACK YOUR LICENCE FEE"
Spending money should be fun.