Though he would argue he was just trying to convincingly impersonate Fritz on that occasion. :)

I would argue that Heinrich is capable of some *very* convincing Fritz impersonations. ;)

Re: the timing - don't forget this was also when Charles Hanbury Williams was, or every recently had been Ambassador, aka the one English envoy who loathed Fritz and vice versa.

Ah, yes, very true. 1750-1751, per Wikipedia.