Thanks Graham,

I've followed your suggestion and have moved the foil entirely. I'm not sure if i'm going to do much with the light leaks as I don't intend to flower inside the computer case (well, maybe one plant - it's too small as it is!)

I'm still thinking what to do with the cooling aspect. I noticed on day 3-4 that the tips of some of the leaves are turning into a yellowly brown colour. Is this a heat issue? It's only very slight and you need to look closely to see it.

thanks again for the help, update to follow!