Does it actually say:
G40003
S/N: 00000039
In which case it's:
Map #G40003-1272cc chip- for owners who are reaching the limits of standard injectors. This map allows larger 250cc/min units to be installed- as recommended for 165bhp+ Recommended modifications are; ported supercharger, 65mm Pulley, larger intercooler, colder spark plugs.