Had a lengthy chat with Wilman at the end of today's filming.
18x05 which we watched being recorded today is current Dr Who, Matt Smith.
They have nobody booked for 18x06! They aren't panicking, yet.
18x07? Axl Rose is flying over from the US just to appear on the show!
Lewis Hamilton is due to be at Dunsfold for other purposes in March. If they get the chance they will pre-record a dry lap with him in the Lacetti.
If the schedules permit once he has finished filming Die Hard 5 in Russia then Bruce Willis will be stopping off on his way home to try the C-apostrophe-D.