Which is grammatically correct an HGV driver or a HGV driver?

Both "an HGV driver" and "a HGV driver" can be considered grammatically correct depending on the pronunciation of the acronym "HGV." If the acronym is pronounced with a vowel sound at the beginning (such as "aych-gee-vee"), then "an HGV driver" is appropriate. If the acronym is pronounced with a consonant sound at the beginning (such as "aitch-gee-vee"), then "a HGV driver" would be more suitable. It is important to consider pronunciation when determining the correct use of "a" or "an" before acronyms.