VS bought 5 pairs of daily slots at LHR. Most of them are leased to Air France (or one of their codeshare partners) at the moment - I think they're being used to operate to Lyon if memeory serves. VS is using a couple themselves for extra services across the Pond.
The 742s at MAN will be phased out as soon as poss to be replaced by 744s - don't know the timescale, but quite a few of the crews are about to come back to the 340, so it must be happening quite soon.
As more 346s arrive, 744s will go to LGW.
At the moment VS is keeping options open on the 343s - some of the leases have already been extended, some have a year or 2 still to run, so for once there's a bit of flexibilty.