CVS tag blocks repository access

[Guy Van Sanden]

Help

I 'accidently' created a numeric tag in CVS by using:
cvs commit -r2.0 <file>
This would, according to the man page, set my revision to 2.0, but it
also created a sticky tag with that name. 
Now I cannot check in anything any more.

Removing the tag with 
cvs tag -d
or cvs rtag -d fails:
tag `2.0' must start with a letter

Does anyone know a clean way out of this?

Thanks very much

Guy