In terms of character and plot, it does not make any sense why Alan would so readily and easily accept Rodney's out-of-the- blue resignation without any further discussion; especially as just a few hours earlier they had been enthusiastically planning a huge expansion of the business together, with no mention of it.
Rodney quits working for Parry Print Ltd, yet doesn't rejoin Trotters Independent Traders until He Ain't Heavy, He's My Uncle (1991).