Is it worth using Lanoguard on my 2018 Jaguar?

Is it worth using Lanoguard on my 2018 Jaguar XF? It has covered only 21000 miles and lives on the drive.

I have a Rover 75 Estate which needs some attention due to rust underneath which will cost £900 - is it worth it?

I have a Rover 75 Estate which needs some attention due to rust underneath which will cost £900. Is it worth it?

What rust treatment do you recommend?

I have a VW T25 Camper that's showing signs of rust in the creases/joins on the bodywork. My plan is to scrape/brush/sand out all visible rust and then treat. I have been looking online for a rust treatment/...