1/32? Biplanes? WW1? You can't do any better than Wingnut Wings kits. Check out their site (http://www.wingnutwings.com/ww/) which includes build ups of all their kits as well as loads of reference material on each aircraft. They are superb kits.
You mentioned the Hawker Hart. I'm not aware of any between-the-wars RAF subjects in 1/32 scale, other than expensive resin kits. Hasegawa produced some 1930s Boeing biplanes in this scale (nice and colourful). They're older 70s kits but still build well.
There are some other 1/32 WW1 subjects from smaller producers like Roden and Special Hobby, a Google search should throw out some possibilities.