In May last year I went on 9 months mat leave. I was granted an extension until July this year, and cannot be granted any further extensions.

I'd like to stay in the field, as I studied for 3 years to become qualifiedand worked for the company for five years..... Getting to the point, my job was full time, BUT I'd like to see if I can return to work part-time.

I am planning on emailing my boss, as I think if I went in and met him with this proposal he'd be a bit shocked and on the backfoot and so no immediately.
Does anyone have any suggestions as to what I can write in the email???