Best MOT Snake Oil?

[cancunia]

I think I've asked this before, but thought I'd see if there are any new contenders.

It's coming up to MOT time & I'm wondering what's best to put into my tank to help the emissions reading.

Millers
Redex

Any others?

[saskak]

I think I've asked this before, but thought I'd see if there are any new contenders.

It's coming up to MOT time & I'm wondering what's best to put into my tank to help the emissions reading.

Millers
Redex

Any others?

Proper Italian tune up, not like my meek 3,500rpm, but you already know this.

[Sol]

I used Wynn's emissions pass on the Subaru import legacy GTB (twin turbo monster with no cats) and as it was UK registered, they insisted on the full cat test. It failed, I put Wynn's in (whole bottle with about a tenner of petrol) and it flew the test after a good blast up the M90. Mind you if it's a diesel then it's a smoke test, so get it as warm as it can be and then circle in for the test so it's hot as toast and it should emit minimum smoke anyway.

[cancunia]

Thanks for the replies. I'm a bit worried about the turbo so am keeping the Italian Tune Up in reserve.
Wynn's was the name I'd forgotten. The MoT is in early March so I'll let the tank run down & choose some snake oil at random then put a full dose in.
The people at Millers have been very helpful in the past and suggested a double dose won't do any harm so maybe that's what I'll choose this time. In any case, a clean through once a year won't hurt.