It's one of the little things that was passed on to me. Hopefully the plants will respond quickly!
I couldn't find enough cardboard too put under the trays so I've upturned some empty pots, put the trays on top of them and the plants inside the tray. They're a good 10-15cm off the floor now. Fingers crossed they'll respond. I'll be gutted if I got start the whole thing again though.