  We consider a single Minkowski brane sandwiched in between two copies of
anti-de Sitter space. We allow the bulk Planck mass and cosmological constant
to differ on either side of the brane. Linearised perturbations about this
background reveal that gravity can be modified in the infra-red. At
intermediate scales, the braneworld propagator mimics four-dimensional GR in
that it has the correct momentum dependance. However it has the wrong tensor
structure. Beyond a source dependant scale, we show that quadratic brane
bending contributions become important, and conspire to correct the tensor
structure of the propagator. We argue that even higher order terms can
consistently be ignored up to very high energies, and suggest that there is no
problem with strong coupling. We also consider scalar and vector perturbations
in the bulk, checking for scalar ghosts.
