I thought about this for a bit, and came up with:

http://maps.google.co.uk/maps/ms?ie=...06545&t=h&z=18

...though I seem to have forgotten to add a turnback siding beyond my
new terminal platforms. The general idea is clear though. Conceivably
you could do the same to the fast line platforms to provide loops, but
given Virgin don't want to stop there at all even if stops didn't
reduce capacity, it's probably pointless.