Hi,

I don't have the exact size to hand but looking at standard size
information on the web, I think it was a 203x133. I guess that would
give you about 60mm bearing by the time you take the beam thickness
away. I've no idea if this is a larger than necessary section.

A dwang is the Scottish term for noggin. The short pieces of wood which
go between the beams to stop sideways movement.

Intumescent paint for fire proofing.

The end of the beam sits on a pad stone and is then concreted in.

Alan.