When it comes to call sign confusion, please can you and your controller colleagues report all occurrences when you feel the similarity between call signs is too significant.
Too little is being done by operators to help remedy the situation and perhaps a little external pressure may help.
Emma, I think we've stopped doing the reporting, don't see any results.
About 2 years ago a local airline decided to change all their call signs by removing the '0' as the 1st digit.
The reason apparently, to reduce call sign confusion.
Result, now a lot of this airline's flight numbers are exactly the same as another airline's numbers and on similar routes...and probably for the next couple of FIRs.
When on the frequency, no problem if it's just 2 of you.
2 days ago, 7 aircraft on frequency, all the same airline, 6 with "similar" call sign, most having the same digit at start and end with only the middle digit differing.
That is 6 extra transmissions to point that out to each and everyone.