Is that a crewman trade badge? The resolution must be off, 'cause I would swear the tank is white...
Yes it is the Crewman (Armour) trade badge, I am betting the white look comes from the flash of the cam at a very close range.
My info might be dated but, for the Armour Corps, the wearing of trade badges was IAW the following (or used to be):
Tank alone= 1 PCF
Tank w/laurels underneath=2 PCF courses
Tank w/crown on top=1 Advanced course
Tank w/crown and laurels=2 Advanced courses
PCF=Primary Combat Function. A Tpr with his QL3 didn't have a PCF, and didn't wear the trade badge. PCFs were/are things like Leo Gnr, Leo Dvr, Cougar Gnr, Cgr Dvr, Coyote Dvr/Gnr, etc. Maybe GW or RecceGuy can correct me if I am wrong or if there is a revised policy. The Adv courses were things like Av D & M (the old CADMS course?), Adv Comms, Adv Gnr, etc.
The fact that the OP said he got it on promotion (guessing to Tpr, w/1st chevron) and that no tailor is available would lead me to guess it is a PRes Armd unit in LFWA (from his profile, he is with LFWA). PRes units, who normally don't get a PCF course as a rule (what the Reg Froce component of the Corps considers a PCF, and that which the Reg Force goes by) have, in the past, used their own system for the Corps trade badges (and I am not saying its right, or wrong...just what I've seen) as:
tank w/laurels=QL4 course
tank w/crown on top=6A
tank w/crown and laurels=6B
Just an educated guess on my part, having been PRes Armd for a few years...I could be mistaken. But for those questioning the fact the OP had it handed to him on promotion leads me to believe it is a PRes mbr. I've seen that happen (much to the dismay of RSS WOs and Sgts ;D). The problem came from PRes Armour Corps, where Recce units would have a QL3 course, a QL4 Recce Crmn crse, a 6A crse (Ptl Cmdr) and 6B (Tp WO) crse, none of which were a true *PCF* course and they seemingly adopted their own way of wearing the trade badges.