If I was in the market for a winter frame I'd definitely check out the Ribbles as they seem very good VFM. I just looked at the geometry, and to get the right size top tube for me I'd have to get a 46cm. I have 4 road frames within 3-4mm of that top tube length, and they're all 51cm! (I'm talking horizontal top tube, centre-centre here.)
There's something seriously odd about that geometry if I'd have to get a frame 5cm smaller in seat-tube, and I thought my frames were slightly longer in top-tube than normal for their size.