Posted: 14/01/2013 at 12:14
Sam, in my neck of the woods the North East Coastal area a calender is not much use, you go by the feel of the weather. We can have snow and ice into March some years and are two to three weeks behind the South and middle England.
There is a heated sand bed in the greenhouse but they also need light, although south facing to pick up the light it is often drab and not really good for sowing.
When we get some good clear days then on goes the sand bed and sowing begins, putting a date or time on it would not work so it is down to experience as to what is the best time.
Seed packets are a general rule as they cannot specify for every local weather condition, Scotland would be even further behind than us, patience can be a virtue in gardening.