Planting Fava Beans is it to late or to early.

Hi. I have just found a packet of Fava beans that i bought this year. Is it to late to sow them. They are in date and not opened. I was going to buy some Broad bean seeds but as these are broad bean seeds anyway, i thought that i would save my money and give these Flava beans ago. I was intending to start them off in a propagator then set them out in the allotment. Do you think this is a good idea or not. Thank you for any advice.