Flt/Grnd Engineer ranks
All rank markings gold/silver rings backed by purple ground. Grnd engineer narrow rings, F/E normal aircrew thick rings. BA uni stores should help. If no purple ground avble G/E 4 gold, F/E 2 or 3 thick. Also add correct uni jacket/trousers. Carry ID with pic in uni + spare pics for poss local ID issue.
Some uni areas have gone out of use, these are the traditional & recognized values.
PS If senior/chief G/E stars up to 3 can be added above rings to show further seniority.