"Note that LLC’s are classified as Professionals for market data subscription purposes which generally implies higher subscription rates than that for Non-Professionals" Does the above applies to any corporate structure around the world? are they all considered Professionals?
I see you are based in the UK, it does the same rule for UK Ltd companies. If you use the API you dont need IB data. For manual order entry through TWS you might.
If your excel sheet doesnt need real time data from TWS. But i guess it might? You can send orders via TWS without being subsribed to data.
Even manually order entry is possible without real time data, but you get a warning dialog from TWS which you might be able to turn off.