Inverness, Scotland.....TA 3000ft unless the Jepp is wrong. (Hope not!! )
As far as I am aware, in the UK the transition altitude is 3000ft except where in the vicinity of an airport a higher altitude is notified.
So the Australian system also ensures that the TA and TL are verticaly separated.
I can't figure out why the UK does not ensure that an aircraft at the transition level is vertically separated from an aircraft at the transition altitude.
IMHO, this could have safety implications where outbound aircraft climb on a SID to the TA.......if an inbound descends to the transition level in the UK, it will get very close to the outbound.
Perhaps, getting the calculation of transition level standardised would be a good first step. After all, not much point having a common TA if every FIR calculates the TL differently.
Regards,
DFC