Being rubbish with cars, I was wondering how you know when they need replacing. Are there any signs in the way the car feels when driving? Got a vrs octavia by the way. Thanks

I think they are 60k or four years but tbh I'd be thinking about it at 40k

Mine were done recently as part of its 4yr service.

I checked mine the other days they are bosch plugs?! anyway they looked ok a light brush over came up good as new.

cheers, think i'll replace just in case. Do brands make difference, i.e. go for the most expensive?

Go for genuine, it's whats designed for the engine.