Hi Guys
Don't get stressed over consultants being brought in by SLT, it's common practice. Use them to your advantage, just be prepared with all the evidence you need to get them on your side then use them to put your ideas across. They can be a big crowbar to getting extra funding for upgrades and new kit for your network, don't fear them, use them.
I've had three of these experiences in the 13 years I've been at our school, every time ended in vast improvements to network infrastructure, be wary of the big sell though, a lot of these "consultants" are just salesmen with technical knowledge, make sure what they're suggesting is what your school needs.