It may be a little early, but I seem to recall early spinach doing well before, so I'll start some off inside, and move to the tunnel and plant in beds as soon as they have a few leaves. Planted NewZealand spinach, giant winter and Bordeaux.
Also put in a few different tomatoes, will put more in as these progress.
Ildi, idyll, aurora, black cherry, black trifele, purple Ukraine, millefleur, and Danish export.
In organising the seeds, I find I have loads of self saved aurora, black cherry and ildi, so if you'd like me to send you some, leave me a comment.