I had added the quote round all mentions of the font, which got rid of all the warnings except for the "No declarations in the rule" I presume this warning is a result of the errors below.
2 Value Error : font-family Property font-family doesn't exist in CSS level 2.1 but exists in [css1, css2, css3] : "Monotype Corsiva CE"
3 Value Error : font-style Property font-style doesn't exist in CSS level 2.1 but exists in [css1, css2, css3] : normal
4 Value Error : font-weight Property font-weight doesn't exist in CSS level 2.1 but exists in [css1, css2, css3] : normal
5 Property src doesn't exist : url(MONOTYP0.eot)
I may have to stay with CSS level 2.