Boardman Hybrid Sizing, Please help!

Hey guys, I am waiting for a Boardman Hybrid Team to be built for me. After Halfords cocked up my original order of a Hybrid Comp I've been offered an upgrade to the Hybrid Team.
I tried the Medium in store but I only just had enough stand over clearance and the reach felt a bit of a stretch, also the seatpost was only out an inch or so.
Looking at the measurements the small should be okay - it's not much smaller than the Medium, but the instore staff keep saying I should be on a medium, even though it feels too big for me. The only measurement they seem to be taking in to account is my height.
I'm 5'8" with a 29" inside leg. Anyone here with similar measurements ride a Boardman Hybrid that can reassure me?
I've done a lot of googling and found someone 5'10" that rides a small because he too felt the Medium was too big.
I tried the Medium in store but I only just had enough stand over clearance and the reach felt a bit of a stretch, also the seatpost was only out an inch or so.
Looking at the measurements the small should be okay - it's not much smaller than the Medium, but the instore staff keep saying I should be on a medium, even though it feels too big for me. The only measurement they seem to be taking in to account is my height.
I'm 5'8" with a 29" inside leg. Anyone here with similar measurements ride a Boardman Hybrid that can reassure me?
I've done a lot of googling and found someone 5'10" that rides a small because he too felt the Medium was too big.
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I'm dreading getting there and finding it doesn't fit, I don't think I'd buy the Medium as it does feel too big and would be uncomfortable over long distances.
How's the bike holding up anyway?
I just can't believe Halfords don't stock at least a S/M/L within the range of the 4 adult Hybrids they stock, if only for sizing.
My local Halfords are terrible.
If I was 100% confident on fit I'd buy it boxed and take it elsewhere to be built.
Sizing looks good to me!