Personal Statement Help Needed

This sounds like a silly question, but I want to know if I need to write 'Member of Parliament (MP)' the first time I mention it as part of my work experience section, or if I can just get away with writing 'MP' only. This sounds really pointless, but I'm applying to a high ranking university and would like to get it right, but ideally I'd like to keep to the shorter term or else I'll have to cut down on words again.