"Can I submit manuscripts to Flapjack Press and are there any job vacancies?"
Flapjack Press is currently closed to unsolicited manuscripts as it has a full publishing schedule.
Anyone speculatively submitting will be directed here.
N.B. One of the most important - and rewarding - aspects of being a writer is research. We suggest you should have done some.
The National Poetry Library has an extensive list of publishers who might be able to help you though.
And there are no job vacancies either.