Originally Posted by
Hannibal Lecter
Wonder what happens if you transfer them to a BAEC account?
will the Avios be marked with a "best before" date, or will validity start
from scratch again when they hit your BAEC account, i.e they'll be valid for 3 years.
That is indeed what I would do if I were in the OP's shoes. Transfer them to a BA account (and transfer them back later to your IB+ account if you want them within IB+).