Tracking number formats

Examples of tracking number formats are:

UK tracking

2 letters and 7 numbers (e.g. AA1234567)

4 letters and 10 numbers (e.g. AAAA1234567890).

International tracking of exports

2 letters and 9 numbers and GB (e.g. AA123456789GB)

12 numbers (e.g. 123456789012)

International tracking of imports

2 letters and 9 numbers and 2 letters (e.g. AA123456789AA)