LGW-MCO 3rd December VS27

We invariably fly VS27 when visiting Orlando, normally PE. In December, we are taking a 'cheapy' trip and managed to get a great M+M fare in Economy. We have booked seats 63A&C and our friends were in 64A&C, but have been moved. According to Virgin, "Your seat numbers have altered due to an aircraft change and consequently
row 64 no longer exists on the current aircraft we are using for this flight".

Does anyone know what aircraft we are likely to be on? Presumably not a Virgin one as all their planes seem to have a row 64. Or has there been a refit on some?

Deb,
It sounds like the info given was slightly wrong.
Possibly they have been moved due to change in aircraft configuration, as they change to suites, we have had our UC seats moved, but could the info that "row 64 now does not exist" be a Virgin reps mistaken take on the info they have been given, or the reading of the seat plan confusion?
Have you cheked on the FC part of the Virgin Atlantic web site, called up your flights and had a look at the seat plan on there?