And the winner is..

The Courgette.
First to be potted outside.

Having done a little research into Companion Planting, yesterday, I bought some Nasturtiums and planted them, along with the Spinach my lovely neighbour gave me, into the same pot as the Courgettes in the hope they will help each other grow and control any pests without me having to resort to polluting pesticides.

They seem to have survived the first 24 hours, so all good so far.