mine were a similar couple of days and no under-heat....amazing. interestingly the cosmos (purity) seeds bought new this year (presume last years seeds) came out first then another few days for the other half to come out, which were the balance of seeds i bought last year.
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And i sowed tomatoes on Thursday ... there were signs of life by Saturday lunchtime.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.