Posted: 09/11/2014 at 07:59
I've just googled 'Scotch bonnet no heat' and found several sites where people are complaining about this. There's a seller on Amazon with some very poor feedback re Scotch bonnet chillies.
It sounds to me as if there's a duff batch of seed out there somewhere. I would talk to the garden centre you bought your plants from and give them some constructive feedback.
I've grown several different varieties this summer, only moderate heat-types as we're not real chilli-heads, and grown outside in our garden we've harvested chillies with really good flavour and plenty of heat, so it doesn't seem as if it's anything to do with the weather conditions this year.