I put the jars in the freezer for a couple of hours to kill the queen wasp and anything that might be inside the nests. When I was sure that nothing was left alive I could take a closer look at them.
To say I am not a big fan of wasps would be an understatement as when my younger son was about six he ran into a wasps nest in a bank in the woods behind our house and was "attacked " by them. We rushed him to accident and emergency but luckily he had no adverse reaction. We counted over 70 individual stings. He is almost 15 now and still very wary of wasps.
Even though I don't like them, I can't help but admire the structure of their nest.
The perfect hexagons in the middle were encased in layers of very thin paper-like material presumably all made from our rafters.
I don't know much about the life cycle of wasps but as we only caught one wasp I think I will be checking our loft at frequent intervals for the next few weeks just in case.