The seeds of a chilli pack the hottest punch, so removing them is a great way to reduce the fieriness. This video from Great British Chefs demonstrates how to de-seed a chilli.
How to de-seed a chilli
1. Cut the stem off the chilli
2. Slice the chilli in half lengthways
3. Use a teaspoon the remove the seeds and pith
4. Place the chilli skin side down and cut into thin strips