I have the opportunity to buy a super high-mileage (+400k miles) Skoda Octavia for £200. Would you want to see a series on it? And if so, what should we do with it?

Videos of handbrake turns in dirt roads until it explodes. And then more videos on tearing it down and fixing it (if possible)

You should make a video inspecting how well the car has held up to this mileage. And maybe take it on a long road trip.

I’d love to see a sleeper build

Turn it into a sleeper
See how much it can take

Tune it to 300whp and Drag race it

Turn it into a rally cross car and race in an event like top gear did in series 18 episode 7

Go full on vr6 or so, as long as it is a cool sleeper!

Of course

Yes do it and wreck it

Yes, you definitely should. An engine tear-down would be cool.