i wore the 19 Mech Brigade flash as well but i was attached to QLR on the same tour. We didnt have to wear their regimental flash as we were Fusiliers.
On a later tour had a slight difference of opinion regarding one that looked a little too much like a battle honour my regiment wasnt entitled to wear. The glider, now worn by the Duke of Lancasters Regiment. As a Fusilier we do not share that battle honour and in my view even when are attached should not dishonour the memory of those who did earn it by wearing them.
either way i never wore it as it was always on the shirt that was in the wash
I have Recently got back from Telic 8 I was serving with the Queens Royal Hussars I was told I had to wear the 20 bde flash. I wore Qrh's beret with my RMLY badge and a QRH rankslide.
If thats any help to you.