Hi Crundy
2 is called Friars Hat and is a 'baccatum'.
3 and 5 are both 'chinense', 3 looks like a habanero and 4 like a scotch bonnet but unsure as to exact varieties.
4 are jalapeno but look like different varieties, but 'annuum'.
1 is also an 'annuum' but I can't be more specific.
6 looks like a 'frutescens' of some description.
Sorry this all sounds a bit vague but there are possibly thousands of different varieties, and sometimes different names for the same variety, and often the fruit looking very similar and the main differences being growth habit and the flowers, or just heat level!
If you want to spend a little time trying to get more exact identification try http://www.thechileman.org/search.php
I hope this has been some help.
Regards
Richard