Structural engineer for i-beam portal frame?

[Clive67]

Hi. Can anyone recommend a structural engineer who can do me some calcs to use i-joists / beams in a portal frame please?

 

It will be a relatively small building for the back garden, 6m X 5m.

 

I've seen @Gone West

post some photos of his build, a similar approach on a smaller scale is what I'm interested in.

 

Thanks

[MikeSharp01]

Our build is a bit similar to @Gone West, we used 300mm I joist but we formed the corners on site and our structural engineer, excellent service, was Steven Evans (http://www.evans-structures.co.uk/).