Structural engineer for glulam beam calculations

My son needs to knock out an internal wall at his house. He needs someone to supply supporting calculations for 2 glulam beams that meet at a T point. The one beam will support first floor joists and the other will run the opposite direction and pick up the the first joist. The long beam that picks up the other will be 4600mm long and the short one that supports the floor joists about 3400mm. The beams will be supplied by UK company and will need to be from their standard stock sizes. Jointing detail from standard available fixings also required. Preferably a UK based SE but possibly from overseas provided designed for UK building regulation compliance.