Lozza - haven't used it myself, but...
I would
seriously recommend shopping around.
I doubt you'll be able to beat them down much on the APR - but you'll stand a better chance if you can wave something under their nose which is going to cost you less
They definately do have some margin to play with

Even if they don't know it... It might need a call to Honda Finance Head Office to aprove, and as ever it will depend on how much they want the deal.