Constant electrical problems (they like bullet connectors... and well Lucas), oil leaks as (believe it or not) some of their castings were actually porous early on, and they are sloooooooooowwwww. I'm talking real slow. Those motors made something like 70HP and the gearing is pretty short. I added a Fairy overdrive to mine and it did 65-70 mph on a good day.
I also broke and fixed everything in mine. I mean everything.
I'd say they are a labor of love. In fact really any old British car might be able to be considered that.
Anyways...... A few jokes:
You know why the British drink warm beer? Lucas makes the refrigerators.
You know why the British don't make computers? They cant figure out how to make them leak oil.
All kidding aside they are neat. You just gotta be willing to work on them IMHO..... you'll develop some downright awesome oil sealing techniques that involve potions like Hylomar and various tubes of silicone combined with all sorts of primitive gasket materials..
I made the switch to Toyota after lots of soul searching because of the above reasons and being tired of fixing things. I also tortured myself with an original mini that I broke and fixed everything on also. I also tend to torture whatever I drive so the British metallurgy and curiously weak yet gigantically engineered parts didn't play well with that tendency.
I'd buy another one sometime for sure. They are WAAAAAYYYYY fun to drive because of how primitive they are and as a side bonus you'd be driving the truck from "The Gods Must Be Crazy", and that's rad.
After reading this, I think I need to stick with Toyotas until my kids have both finished HS and I have more time to fix things. Thanks for the primer on Rovers.