I was quite right; adding the jellied stock turned out to be rather a disaster. The dropped one took it better than the other but neither can I completely fill.
I have a little more filling left over from yesterday and I'm thinking of getting some good sausage meat to bulk it out, maybe add some apple and spice for taste and having a go at another, more experimental one. Or maybe I should play safe and just use sausage meat and more bacon.
What a shame.