  We increase the isolation of a superconducting double dot from its
environment by galvanically isolating it from any electrodes. We probe it using
high frequency reflectometry techniques, find 2e-periodic behaviour, and
characterise the energy structure of its charge states. By modelling the
response of the device, we determine the quasiparticle poisoning rate to be
significantly worse than that of a unisolated double dot, and conclude that
quasiparticle exchange between the dot and the leads is an important relaxation
mechanism.
