A346 on VS1 / VS2 - why ?

I've just entered my API for a VS1 trip next week. Whilst in the "update booking" bit I had a look on the seat map to try and jockey a better seat - in Y as per policy.
Both the VS1 on Monday 11th Dec and the VS2 on 15th Dec show as a A346 - anyone any ideas why?

I would have thought with the $$ going through the floor there would be legions of people travelling before Christmas - so why put a smaller aircraft on?
Bad maintenance scheduling?

CB

VS 1/2 Will be opersterd by a 346 for the winter season.

In return for the winter season VS 5/6 changes from a A346 to a 747.

I was on VS1 on Thursday and it was pretty full. All Y was full, all W was full. J had 1 or 2 spaces.

Paul

Thankyou for that information - though I think blissful ignorance may have been a better ploy given the thought of a sardine-like Y cabin!