Bit of a thread numb but has anyone tried this? I was watching wheeler dealers and ed, the mechanic, said its pretty good. Obviously product placement means he has to be nice about it but the general jist of it is a bit like redex but a much deeper clean. It's said to improve (or restore) power, emissions, and mpg. A few people on jaguar and land rover forums have had promising results too, some having rr results show significant power increases. There's a few pics floating about showing much cleaner internals.
I'm tempted to try it as there is a service centre near me.