Which Sierra?

[Jezzer99]

Don't worry Bonzo, I wasn't having a dig

And having owned "classic" cars (old MGs) for years I'm acutely aware of how an MOT failure doesn't necessarily mean the car isn't safe to drive - "mumble mumble, you failed it on what???"

There's a good point though that buying a decent running donor gives you a no stress chance to check that it's all running good.