There has been an upsurge of "recruitment companies" offering jobs through unsolicited e-mails requiring, almost other things, your Personal registration number at the state workforce office.
There is NO SUCH THING.
This is pure
SCAM mail and should be ignored!
NO UK or European company is going to offer a job without firstly an interview and certainly NEVER by unsolicited e-mail.
Here's a number of other sites that this has been raised at:
www.scamwarners.com • View topic - Centrum Jobs Team
Bulgarian Scam
Is this a scam? - Fraudwatchers
All these "recruitment companies" are after is your money, pure and simple.
They will NEVER deliver anything in return and you will be out of pocket.
So delete any e-mails of this type and move on with your life.