"Gerard" writes:
Looks like it is burnt at the top. Most likely by that air conditioner that

There has been a couple of scorchers the last 3 weeks, and the Christmas/new
year hot days we had here in Melb. were in Hobart and they didn't get a drink, I
think that might have contributed to the problem, Oh well off with the old in
with the new so they say.

I haven't looked at your pics, but I'm guessing sunburn. Only outside
leaves? And on the top and side exposed to the sun? I was surprised a few
years back when some of our camelias developed brown leaves after a day of
scorching heat, yet they had not been burnt in a dozen previous summers.

Don't remove the burnt leaves. You will just be exposing leaves even more
tender to the next day of extremes. Let the burnt leaves be, so they can
give some protection for the remainder of the Summer.
--
John Savage (for email, replace "ks" with "k" and delete "n")