Abstract: A tray including a moulded tray form defining a base, an upstanding peripheral wall or upstanding peripheral walls from the base to define a containment region, and a peripheral rim at the distal extremity of the wall(s). There is set down in the peripheral rim at least one recess adapted to and/or which will allow gas exchange from the containment region of the tray form to the outside of the tray form, and/or vice versa when the peripheral rim is lidded by a lidding means such as a wrap enveloping the tray form, itself having a ventilation feature for gas exchange through the wrap away from the peripheral rim and the containment region lidding portion of the wrap, or a lidding sheet affixed to the peripheral rim but not down into the recess(es) to allow for a ventilation opening to remain via the at least one recess between the containment region and the outside of the tray form.