Afternoon Folks,
Although i haven't had written confirmation yet, I've just been verbally informed by the DVLA that IVA bookings at Derby are being cancelled. I phoned the 03001239000 number to double check. Might be worth checking for any other bookings around the country.
Mine was planned for the Friday 20th March so they aren't giving much notice to let you know (probably lots of geniune reasons why not).

Cheers,
Mark