Boardman Hybrid Comp sizing

I have the opportunity to purchase a used Boardman Hybrid comp at a very good price, I havn't seen it yet but what I do know is that is is a 45cm frame, small size. I am 5'7, 29in inside leg, do you think it will be suitable?
I already have a BMan road team in medium, but the seat height is quite low so I am in between frame sizes.
 
As it turns out, its too small
 
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