M&S Butter Basted Turkey Joint - how long will it keep?

[mumtoone1]

Every year I get my christmas food from M&S Food to order.

I get the Butter basted Turkey Joint at 25.00 approx which feeds 6-8 people.

I note at the moment on there standard food to order they have a butter basted turkey joint that feeds 4 to 6 for 8.50! thats a big saving. how long would this last in the freezer? if I bought 2 in September would it be ok for Christmas Day?

Does anyone else do this?

This suggests it could be kept up to 9 months so I'd imagine it would be ok for Christmas. I'd wrap it well though, so it didn't get freezer burn.