VS401 going tech on 18/12?

Hi
I was on 401 on 19/12 and was surprised to see it was a 340-300, not the 600 scheduled and shown on the seat map.
On asking the crew they said the original plane had gone tech the night before and they had to fly a 300 over from Gatwick? This didn't seem to make sense as the 300 we had was installed with V-Port!
Anyone know what happened to the 600?
Cheers
Paul
I was on 401 on 19/12 and was surprised to see it was a 340-300, not the 600 scheduled and shown on the seat map.
On asking the crew they said the original plane had gone tech the night before and they had to fly a 300 over from Gatwick? This didn't seem to make sense as the 300 we had was installed with V-Port!
Anyone know what happened to the 600?
Cheers
Paul