Typically there aren't any relays for dip/main headlamp control. The only Morgan I'm aware of that does use one is the 5 speed V twin M3W. I know some have added them to save the dip/main light switch contacts but it's designed to cope so unnecessary extra complexity in my view.
Using a relay for spotlamps is advisable though, however if the car used LED's all round you could easily get away without.
