Hi Dj, whereabouts in Cornwall are you? The weather down ther is certainly a lot milder than here in East Anglia. I was born in Devon and grew up there. However, I would question your reading of 35 degrees today, was it a typo? Any thermometer should be placed out of direct sunlight so that you record the air temperature, not the temp reached by direct sunlight on the thermometer.

Personally, here in E Anglia I am biting my nails waiting to sow toms etc, it's far too early. They will germinate either in a heated propagator or on a windowsill, but you then have the problem of looking after them until they can be planted out.