Readback of Transition Levels
 

We having a discussion on the application of some rules and specifically the requirement to readback clearances and come across the following from ICAO Annex 11 which requires

The flight crew shall read back to the air traffic controller safety-related parts of ATC clearances and
instructions which are transmitted by voice. The following items shall always be read back:
a) ATC route clearances;
b) clearances and instructions to enter, land on, take off from, hold short of, cross and backtrack on any runway; and
c) runway-in-use, altimeter settings, SSR codes, level instructions, heading and speed instructions and, whether issued by the controller or contained in ATIS broadcasts, transition levels.

Most of that is no surprise but the readback of Transition Level when issued by ATIS is something we haven't really come across from crews in our region (Southern Africa). Crews normally advise us of the ATIS information on 1st contact but not TL, however when descended through the TL (usually FL110 here) ATC changes the instruction from Flight Level to issue the altitude on QNH.

Is it usual for crews to readback the TL when this is included on an ATIS broadcast elsewhere and how strictly is this enforced in your region?

Pretty sure I've never heard the TL broadcast on any UK ATIS so no need for a readback.
Same process here when changing from an altitude to FL (or vice versa).

Transition level is normally included in ATIS in the UK. What ATIS have you been listening to?

Really? It's displayed on ADIS I grant you, but I've never heard it on ATIS

I heard two examples of the TL being included in ATISs only today...in UK.

But never read it back, or been asked to do so.

When checking in to a busy London approach frequency, when there are so many first call items to remember, if the QNH is forgotten it's no big deal.
The QNH will be provided on first descent to altitudes so the initial omission of QNH is saving the controller's time.

Personally I don't see the point of announcing the QNH on check in to approach along with the ATIS, A/C type, cleared level, routing, etc. QNH is a mandatory readback when first cleared to an altitude, so why clog up the RT. Announcing the ATIS you've copied surely implies you have the QNH anyway?