The £ has been on the slide since the populace voted for Brexit, it will not get better with a coalition government.
That is because our future is a bit up in the air, BREXIT hasn't happened yet and we have no clue of the terms, once the markets know our intentions and its safer to invest they will go up. The result last night surprised everyone hence the crash (crashed from the exit poll). Same with Brexit morning.
People won't invest in something uncertain, and about the coalition..apart from it being the worst idea since green tomato ketchup, you have a far right hard brexit with teaming up with "borderline" terrorists who prefer a soft brexit among other things..how on earth are we going to judge what comes out of that. I knew she was warning us about a coalition of chaos, but didn't think she was going to have a hand in leading it!
P.S. Not sure what it can contribute to state this but I was a strong remainer. And yes apologies for turning into a keyboard politician, I am raging slightly from the last three polls (BREXIT, TRUMP (not directly for us, but... what can I say) and this one).