Have accounts been prepared to April 12? Did you receive B1 and abridged accounts to be signed last October. Did you pay a fee for prep of accounts, filing a CT1 and B1?
If you have had all the above done by your accountant and they failed to file the signed B1, then they should now file the audited accounts and pay the late filing fees.
If not then I think that there has been a breakdown in communication and you must bear some responsibility.
Clearly you need to talk with them as a new auditor will charge you a large fee for the audited accounts.