I'll give a nod to installing a WAP (Access Point) where it is needed.)
Your IT should have suggested this.
Hello, i'm working on a site at the minute that has issues with wireless networking. You stand next to the router and get about 13-15 mbps (the router is in the store room) but next door is the shop floor where wireless is needed the most. You can terrible speeds in there, I have even got kbps. It isnt a particularly large store, but we really need to get these speeds boosted. We have talked to TalkTalk Business, and they said they sent an Openreach engineer out to the exchange and said they fixed the problem. Aslong as we have a 'suitable' hardwired speed, they couldn't give a toss.
How do you think we could fix the wireless speeds? Access Points?

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