Given the proclivities of the British Upper Class, this is entirely possible. Even John Taylor was rumored to partake of this peculiar pleasure on his long sojurns into the bush..

Anything's possible...perhaps even a threesome??? Although one wonders how this might be orchestrated on a guncase.....presumably pressed into service when it was discovered that the picnic rug had been left behind??

I suppose we shall just have to wait on the outcome on the ongoing DNA tests to clear up this little byway of history....