All the answers are birds
12 Air infection (4 6)
18 No flipping score (5 4)
22 Duck found in bed (4)
28 Age of the hog(6)
29 Mix German River (5) Heron fron Rhone isn't right because it's not in Germany
31 Pint after hours (8)
42 Discovered in the Bell Inn, Eton (6) (I already have Linnet for Scored 50 L in net)
thank you all for your help - I've got the river and ultimately the bird - let me know if you want puting out of your misery as well I like elanet quinie