On Wed, 15 Sep 2004 08:10:59 +0100, a particular chimpanzee named
"Andrew Barnes" randomly hit the
keyboard and produced:

The calcs need to satisfy a building officer!

Are you sure? Has he asked you for calculations, or just to let him
know what beam you intend to put in? IME, for a 2m opening, if you
were to specify a reasonably-sized beam (i.e., a 178 x 102 UB) then
it's unlikely that the BCO wouldn't accept this without calculations.

If necessary you could try a box lintel from Catnic, who I understand
will provide calculations for you.
--
Hugo Nebula
'What you have to ask yourself is, "if no-one on the internet wants
a piece of this, just how far from the pack have you strayed?"'