when do they post what labs will be showing at westminster?

the same as with any show, an hour before the show begins.

Thanks. For some reason I thought I saw previous listings before the day of the show. This makes more sense though.

The show starts on Monday so the catalogue is posted Monday morning even though Labs are not on until Tuesday, so you will get to see the day before.

I thought they did it about a week before. Guess I was wrong, too.