I bought a bag of sealed LEGO from the second hand shop. It is labelled 6 so must be part of a larger set. Is anyone able to identify it?
The "Red Support 1 x 6 x 5 Girder Rectangular" answers this.
EDIT: There are no "Trans-Light Blue Panel 1 x 2 x 2 with Side Supports - Hollow Studs" in 3368, so this is definitely 4430.