I flew to UVF with VS last November (the Sunday non-stopper from LGW)
The pax that should have arrived on the BWee 340 shortly after us didn't arrive until the next day - courtesy of, I think, Air Atlanta, who positioned a 747-200 into LHR to operate the service - if you were only going to the Carribean for a week, this would would be a real pi55er.
There was a supplement on our Package to fly with VS (or BA) over BWee, but I'm glad we paid it.
VS have also added more flights since then.