I believe I raised the (Kunming?) controller's BP one night when we were westbound HKG to FKW in a B747 and had a line of Cb arise to our fore.
Although there was lots of China on the right and the Viet border some way to the left, we turned left towards a gap which appeared. The gap disappeared.
Upshot was that we got 'very close' to the border with the controller screaming at us to turn right or return to HK and us assuring him that we would do so very shortly.
We thanked him profusely for his services, wished him a very good night and neither of us went into print re the matter
